go on google and search for a paintball shop near your zipcode. There must be one somewhat close, and they fill Co2 pretty cheap. good luck
125g semi planted. 2 silver angels, 14 silver tips, 16 white fin ornatus tetras, pair of Nicaraguense, pair of nototus severums, trio of firemouth cichlids. 2 FX5s, 1 1500gph circ pump, 2 48" LED lighs, and a HUGE piece of driftwood.
Great place to get co2 for your kegerator and fishtank (if you dabble in that hobby), is U.S. airweld on 40th street and university. They fill your tank or will do an exchange for $25. They also rehydro at $20. I've been getting gas here for years and they always fill your tank to the brim.