Originally Posted by
datlas
FWIW cheapest C02 is typically unthreaded (I get a box at WalMart, 15 for $7 so less than 50 cents apiece).
BUT...you will need to have an inflator that accepts unthreaded ones. Many only take threaded which are more expensive.
On the other hand, you can get threaded 16g canisters in boxes of 2 dozen for a a dollar a cart on eBay