I have bought and Arduino controlled one of these:
http://www.dealextreme.com/details.dx/sku.14965
30 RGB LED's For a little over 16 US$ - free shipping is a good deal
I have bought and Arduino controlled one of these:
http://www.dealextreme.com/details.dx/sku.14965
30 RGB LED's For a little over 16 US$ - free shipping is a good deal