Vilros.com has the Vilros FunForce Touch Controller – Works with PC Mac and Raspberry Pi for $20.13 + Free Shipping after code "SUMMERFUN".
I’ve bought from Vilros in the past. They are very reliable and they have these random good deals every once in a while.
I thought this was really cool because it can work with PC and Mac too, not just Raspberry Pi.
Some deets:
- Re-invent everyday objects to be used as a touchpad
- Easy Simple Setup is Great For Any Children (or Adults) who want to learn While having fun
- Great for the inventive child!!
- Just plug, clip, and play! No programing knowledge needed
- 1000S of possibilities! Draw your own game controller! Dance like never before!