Components

Arduino Uno: $29.95 http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2121105_-1

LED multicolored X 9: $10.95 for 20 ($0.55 each)

4 2kOhm resistors: Free

1 1.5kOhm resistor: Free

2 MAX6969 LED drivers: Free sample 

16 Key Keypad Matrix: $9.95 http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_169245_-1

 

Rough Estimate at $45 to build. 

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