diff --git a/packages/cli/bin/find_mounts.dart b/packages/cli/bin/find_mounts.dart
index fa8f3c1d..ff76a317 100644
--- a/packages/cli/bin/find_mounts.dart
+++ b/packages/cli/bin/find_mounts.dart
@@ -1,9 +1,9 @@
-import 'package:cli/behavior/deliver.dart';
 import 'package:cli/cache/caches.dart';
 import 'package:cli/cli.dart';
 import 'package:cli/logger.dart';
 import 'package:cli/nav/route.dart';
 import 'package:cli/printing.dart';
+import 'package:cli/trading.dart';
 
 Future<void> command(FileSystem fs, List<String> args) async {
   final marketPrices = MarketPrices.load(fs);
diff --git a/packages/cli/bin/list_nearby_buys_for.dart b/packages/cli/bin/list_nearby_buys_for.dart
index 32c37660..a2da529e 100644
--- a/packages/cli/bin/list_nearby_buys_for.dart
+++ b/packages/cli/bin/list_nearby_buys_for.dart
@@ -1,9 +1,9 @@
-import 'package:cli/behavior/deliver.dart';
 import 'package:cli/cache/caches.dart';
 import 'package:cli/cli.dart';
 import 'package:cli/logger.dart';
 import 'package:cli/nav/route.dart';
 import 'package:cli/printing.dart';
+import 'package:cli/trading.dart';
 
 Future<void> command(FileSystem fs, List<String> args) async {
   final marketPrices = MarketPrices.load(fs);
diff --git a/packages/cli/lib/behavior/deliver.dart b/packages/cli/lib/behavior/deliver.dart
index 4be8bfb0..94287f9e 100644
--- a/packages/cli/lib/behavior/deliver.dart
+++ b/packages/cli/lib/behavior/deliver.dart
@@ -5,102 +5,13 @@ import 'package:cli/behavior/trader.dart';
 import 'package:cli/cache/caches.dart';
 import 'package:cli/logger.dart';
 import 'package:cli/nav/navigation.dart';
-import 'package:cli/nav/route.dart';
 import 'package:cli/net/actions.dart';
+import 'package:cli/trading.dart';
 import 'package:collection/collection.dart';
 import 'package:meta/meta.dart';
 // Go buy and deliver.
 // Used for modules.
 
-/// Calculated trip cost of going and buying something.
-class CostedTrip {
-  /// Create a new costed trip.
-  CostedTrip({required this.route, required this.price});
-
-  /// The route to get there.
-  final RoutePlan route;
-
-  /// The historical price for the item at a given market.
-  final MarketPrice price;
-}
-
-/// Compute the cost of going to and buying from a specific MarketPrice record.
-CostedTrip? costTrip(
-  Ship ship,
-  RoutePlanner planner,
-  MarketPrice price,
-  WaypointSymbol start,
-  WaypointSymbol end,
-) {
-  final route = planner.planRoute(
-    start: start,
-    end: end,
-    fuelCapacity: ship.fuel.capacity,
-    shipSpeed: ship.engine.speed,
-  );
-  if (route == null) {
-    return null;
-  }
-  return CostedTrip(route: route, price: price);
-}
-
-/// Find the best market to buy a given item from.
-/// expectedCreditsPerSecond is the time value of money (e.g. 7c/s)
-/// used for evaluating the trade-off between "closest" vs. "cheapest".
-CostedTrip? findBestMarketToBuy(
-  MarketPrices marketPrices,
-  RoutePlanner routePlanner,
-  Ship ship,
-  TradeSymbol tradeSymbol, {
-  required int expectedCreditsPerSecond,
-}) {
-  final prices = marketPrices.pricesFor(tradeSymbol).toList();
-  if (prices.isEmpty) {
-    return null;
-  }
-  final start = ship.waypointSymbol;
-
-  // If there are a lot of prices we could cut down the search space by only
-  // looking at prices at or below median?
-  // final medianPrice = marketPrices.medianPurchasePrice(tradeSymbol)!;
-  // Find the closest 10 prices which are median or below.
-  // final medianOrBelow = prices.where((e) => e.purchasePrice <= medianPrice);
-
-  final costed = <CostedTrip>[];
-  for (final price in prices) {
-    final end = price.waypointSymbol;
-    final trip = costTrip(ship, routePlanner, price, start, end);
-    if (trip != null) {
-      costed.add(trip);
-    } else {
-      logger.warn('No route from $start to $end');
-    }
-  }
-
-  final sorted = costed.toList()
-    ..sort((a, b) => a.route.duration.compareTo(b.route.duration));
-
-  final nearest = sorted.first;
-  if (sorted.length == 1) {
-    return nearest;
-  }
-
-  var best = nearest;
-  // Pick any one further that saves more than expectedCreditsPerSecond
-  for (final trip in sorted.sublist(1)) {
-    final priceDiff = trip.price.purchasePrice - nearest.price.purchasePrice;
-    final savings = -priceDiff;
-    final extraTime = trip.route.duration - nearest.route.duration;
-    final savingsPerSecond = savings / extraTime.inSeconds;
-    if (savingsPerSecond > expectedCreditsPerSecond) {
-      best = trip;
-      break;
-    }
-  }
-
-  return best;
-}
-
 /// A job to buy a given item.
 @immutable
 class BuyJob {
diff --git a/packages/cli/lib/trading.dart b/packages/cli/lib/trading.dart
index 2e733582..7788942e 100644
--- a/packages/cli/lib/trading.dart
+++ b/packages/cli/lib/trading.dart
@@ -597,3 +597,92 @@ Future<CostedDeal?> findDealFor(
     filter: filter,
   );
 }
+
+/// Calculated trip cost of going and buying something.
+class CostedTrip {
+  /// Create a new costed trip.
+  CostedTrip({required this.route, required this.price});
+
+  /// The route to get there.
+  final RoutePlan route;
+
+  /// The historical price for the item at a given market.
+  final MarketPrice price;
+}
+
+/// Compute the cost of going to and buying from a specific MarketPrice record.
+CostedTrip? costTrip(
+  Ship ship,
+  RoutePlanner planner,
+  MarketPrice price,
+  WaypointSymbol start,
+  WaypointSymbol end,
+) {
+  final route = planner.planRoute(
+    start: start,
+    end: end,
+    fuelCapacity: ship.fuel.capacity,
+    shipSpeed: ship.engine.speed,
+  );
+  if (route == null) {
+    return null;
+  }
+  return CostedTrip(route: route, price: price);
+}
+
+/// Find the best market to buy a given item from.
+/// expectedCreditsPerSecond is the time value of money (e.g. 7c/s)
+/// used for evaluating the trade-off between "closest" vs. "cheapest".
+CostedTrip? findBestMarketToBuy(
+  MarketPrices marketPrices,
+  RoutePlanner routePlanner,
+  Ship ship,
+  TradeSymbol tradeSymbol, {
+  required int expectedCreditsPerSecond,
+}) {
+  final prices = marketPrices.pricesFor(tradeSymbol).toList();
+  if (prices.isEmpty) {
+    return null;
+  }
+  final start = ship.waypointSymbol;
+
+  // If there are a lot of prices we could cut down the search space by only
+  // looking at prices at or below median?
+  // final medianPrice = marketPrices.medianPurchasePrice(tradeSymbol)!;
+  // Find the closest 10 prices which are median or below.
+  // final medianOrBelow = prices.where((e) => e.purchasePrice <= medianPrice);
+
+  final costed = <CostedTrip>[];
+  for (final price in prices) {
+    final end = price.waypointSymbol;
+    final trip = costTrip(ship, routePlanner, price, start, end);
+    if (trip != null) {
+      costed.add(trip);
+    } else {
+      logger.warn('No route from $start to $end');
+    }
+  }
+
+  final sorted = costed.toList()
+    ..sort((a, b) => a.route.duration.compareTo(b.route.duration));
+
+  final nearest = sorted.first;
+  if (sorted.length == 1) {
+    return nearest;
+  }
+
+  var best = nearest;
+  // Pick any one further that saves more than expectedCreditsPerSecond
+  for (final trip in sorted.sublist(1)) {
+    final priceDiff = trip.price.purchasePrice - nearest.price.purchasePrice;
+    final savings = -priceDiff;
+    final extraTime = trip.route.duration - nearest.route.duration;
+    final savingsPerSecond = savings / extraTime.inSeconds;
+    if (savingsPerSecond > expectedCreditsPerSecond) {
+      best = trip;
+      break;
+    }
+  }
+
+  return best;
+}
diff --git a/packages/cli/test/behavior/deliver_test.dart b/packages/cli/test/behavior/deliver_test.dart
index 4fa5b0e2..75f8789c 100644
--- a/packages/cli/test/behavior/deliver_test.dart
+++ b/packages/cli/test/behavior/deliver_test.dart
@@ -107,19 +107,4 @@ void main() {
     );
     expect(waitUntil, isNull);
   });
-
-  test('findBestMarketToBuy smoke test', () {
-    final ship = _MockShip();
-    final routePlanner = _MockRoutePlanner();
-    final marketPrices = _MockMarketPrices();
-    when(() => marketPrices.pricesFor(TradeSymbol.ALUMINUM)).thenReturn([]);
-
-    findBestMarketToBuy(
-      marketPrices,
-      routePlanner,
-      ship,
-      TradeSymbol.ALUMINUM,
-      expectedCreditsPerSecond: 7,
-    );
-  });
 }
diff --git a/packages/cli/test/trading_test.dart b/packages/cli/test/trading_test.dart
index 172f879a..95a7f2cf 100644
--- a/packages/cli/test/trading_test.dart
+++ b/packages/cli/test/trading_test.dart
@@ -516,4 +516,19 @@ void main() {
     expect(costedDeal.expectedUnits, 100);
     expect(costedDeal.maxUnitsToBuy, 10);
   });
+  test('findBestMarketToBuy smoke test', () {
+    final ship = _MockShip();
+    final routePlanner = _MockRoutePlanner();
+    final marketPrices = _MockMarketPrices();
+    when(() => marketPrices.pricesFor(TradeSymbol.ALUMINUM)).thenReturn([]);
+
+    final market = findBestMarketToBuy(
+      marketPrices,
+      routePlanner,
+      ship,
+      TradeSymbol.ALUMINUM,
+      expectedCreditsPerSecond: 7,
+    );
+    expect(market, isNull);
+  });
 }