Your gun isn't going to shoot itself is it? You're going to need some air. C02 is the cheapest and most readily available source there is, so why not start here?
12oz CO2 Tank Features:
High quality aluminum 12 Oz Co2 Tank with industry standard pin valve
Approximately 700 shots per fill, never have to worry about running out of air mid-game
We receive fresh tanks weekly. You will not receive out of date tanks
All CO2 tanks are shipped empty to comply with Department of Transportation laws