Oxygen Regulator Kit w/ .5 Stone Wort Aeration, Fermentation, Homebrewing & Beer

This is the reverse threaded oxygen valve you need to use the bernzomatic red oxygen cylinders available at home depot or the like.

View EBAY item:
Oxygen Regulator Kit w/ .5 Stone Wort Aeration, Fermentation, Homebrewing & Beer

See an older more detailed post here:
http://goldfishgarage.blogspot.com/2010/12/home-depot-disposable-oxygen.html

Home depot disposable oxygen

I bought this valve as a beer wort aerator. The bottle of oxygen is $8 at home depot.

The valve has traveled with an empty box, a bottle was purchase, fish packaged and the valve and fish shipped back.

Here is the best deal I've found but I did not purchase it from them:
Oxygen valve for disposable red tanks from Home Depot.

All mine came from craigslist. Both the beer version and the real cylinder/regulator. The later is much more cost effective in the long run but you can ship or travel with the little valve and get the oxygen at any hardware store.

For the main tank I got one of these (minus the regulator):
http://www.aquaticeco.com/subcategories/1120/Air-Filling-Kits

Here are the two individual pieces:
http://www.aquaticeco.com/subcategories/1116/Air-Nozzle
http://www.aquaticeco.com/subcategories/2464/Oxygen-Hose

This seems to be the easiest/cheapest ($60) plus you have a cutter/brazer if you're into that sort of thing:
http://www.homedepot.com/h_d1/N-5yc1v/R-202185043/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053