bill_of_materials.txt

Amount	|	Part						|	Cost
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1x		|	Rasberry Pi					|	$30
1x		|	DS3231 RTC Board			|	$5
1x		|	i2c Audio class-D Amplifier	|	$10
2x		|	Speakers					|	$10

Screen
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BW screen + 5 button pad on PCB
http://emsystech.de/lcd-display-add-on-for-raspberry-pi/

1.8 Inch Color  TFT SPI			| $5
keypad							|