The details for building a theremuino are here and the original crackle circuit is available here.
However if you want one and don't have the kit/knowledge/motivation to build it yourself, I'll make one for you.
As standard they come in a wooden box, but I'm happy to talk about fitting them into anything your heart desires, as long as it can be fabricated or drilled. Want a crackleplant? No problem :)
Theremuinos are the performance kind with an infra-red sensor, note on/off button, rude/polite switch, and controls for grain length, speed and volume. They come with a 1/4" jack output so you can put them through a guitar amp or into a PA.
Crackle instruments have a volume control and speaker built in.
Want one? Order here
Prices are for standard versions. Mods (e.g. unusual cases) extra...mail me and we'll figure it out. Pay by Paypal or bank transfer.