I can't remember how much exactly, but I think for something like a 25 pack, it's like 12 bucks. It's well worth the investment of a CO2 gun that takes both kinds of cartridges. I got 2 packs myself, and I paid about 25 bucks for the two boxes, and I have 50 cartridges I can spare, so I don't even have to worry about wasting precious moments pumping with those pathetic hand pumps again!
Koffee