eBay item #7347510568 is probably the best looking circuit-bent Casio SK1 sampler I've ever seen - with a MS20-style wooden casing, a built-in sequencer and an alligator-clip patchbay (you could probably also use worms). The seller needs a serious lesson in writing eBay descriptions - 2,200 words with no paragraph breaks, but he's sold some pretty cool things in the past, like #7335210401, a crazy-looking microphone built into a paint can. The SK1 will set you back $375 on Buy It Now. (via Get Lofi - so visit his blog if you have trouble with my eBay links)
UPDATE: It was sold, but now it's been relisted (presumably some deadbeat MT reader couldn't pay up): #7347969742