Here's one that is almost as small (25mm square x 10mm thick) for $2.50.
If you want really, really small fan then this one is 4mm diameter x 8mm long (~3/16" x 3/8") for $1.25. Just grind the weight into a rough fan shape, or replace it with a homemade plastic blade.
I was fiddling around with my paintball gun, and I was about to install a QEV in it (makes the bolt cycle faster, among other things), and I thought...
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PM me if you want one. And they pretty much are only useful on bb sized ammo.
I made a mini out of a pen tube for the chamber and a 3.5 inch 1/8 inch ID piece of clear tube. I haven't been able to fire it yet cause it is nearly...
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Im using butane, I should probably get it so I can but the fuel in at the bottom or middle rather than up at the top