I got this for $10 plus $5 shipping, it works as a USB joystick. You plug in an actual joystick which has 5 1/8" jacks for a footpedal and the 4 pads. I use it with this plugin that can remap joystick events to midi note-on.
No large sized drum frame to take up space, you could probably wire up some DIY piezos and plug them in as a hub, hook up 2 for a larger kit. Just pads with wires, very touch sensitive which was my main worry, that I'd have to hit them hard(loud). The orange square at the bottom there is the footpedal.
