A few years ago I opened up a DVD player and had an epiphany. I'm still waiting for it to wear off.
Huge heatsink with fans, peltier cooler, computer power supply, a glass jar, some alcohol, a source of alpha particles, and the 3D printed parts to hold it all together.
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Argh! I've been meaning to! I think it just barely gets cold enough to work but I never actually saw the particles. Maybe this was due to contrast so I upgraded the 3D printed part to be semi-curved around the inside of the glass and form a black background. it's currently sitting in a box in the lab at school.
Here's a vote for saying more about your cloud chamber: +1.