Yeah these keypad thingys are pretty expensive but I guess thats what u have to pay for custom music interfaces. U can get a korg padkontrol for $190 USD and that is a professional product so $240 for a kit that u build yourself seems expensive. I think the sparkfun ones are so expensive cause of the size of the pcb (10cmx10cm). It's actually cheaper to buy the keypad kit from monome if you want to make a 8x8 grid. If you've got the programmer then thats one less thing u have to buy
Yeah if i could find an 8x8 toy thingys, all i want is the keypad, leds and switches and i'd have to hack it apart and use my own interface chips. I'm gonna keep looking in the $2 shops, surely there is something out there!