Wow! That's cheap. I'm definitely going to use ebay for this. That works beautifully too, since the shipping is cheaper AND Digikey doesn't accept Paypal. Thank you so much for the help and info. I'm glad you like the idea, and I will make sure to keep everyone posted.
:edit: Just bought my Arduino and spent my remaining $20 Paypal balance on 100 6mm momentary switches, 100 18000mcd green LEDs, 5 SI/SPO shift registers and 4 multiplexer/demultiplexer chips. All of it should arrive within the next two weeks. I'm quite excited. Also, I get a whole bunch of free resistors with my LEDs. Thanks ebay/MikMo! :/edit: