+1 on getting a bigger tank. I have two 5lb tanks (2 kegerators because I'm too lazy to walk out to the garage in winter) and each of them costs me $5 to fill. I spent $60 on each of them brand new. I go through about 8-12 kegs before it needs refilled. If you bought a paintball tank, you'll end up filling it after every few kegs which could get annoying.