Sandpaper Module
Sandevistan is a two-channel piezo contact microphone instrument. It features a square of 50grit sandpaper adhered to the front panel for greater sonic exploration, an input for external contact mics and other audio sources, and infrared LED based active distortion.
https://www.youtube.com/watch?v=zLX5OO1LByQ
Available as an assembled Module and as a DIY project.
This Module is currently available.
$115