Does anyone make / sell homemade CO2 chambers or rodent racks online?

[satomi325]

satomi- That pic actually looks simpler than other CO2 chambers I've seen... What kind of CO2 canister is that and does the valve at the top come with it?

Some CO2 chambers have an extra hose going into a container of water for air escape and prevention of oxygen coming back into the chamber, but it's not necessary. All you really need is a container and CO2 canister.

It's not my picture, but the CO2 canister is one for welding. (I don't have a picture of my set up because it's usually in storage)
But most CO2 canisters are built the same way with a valve. If yours doesn't have a regulation valve, some folks use the ones for paint balling (http://www.shop4paintball.com/Remotes_s/77.htm)