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AI Adapter ($15)+ Propane (3 for $15) = Cheapest route.
CO2 cartridges in bulk are $0.60-$1.00 in large bulk (100-150 capsules+).
CO2 has more recoil, I would suggest going CO2. You also get better performance in the winter, but GG mags are easier to deal with - being that propane is cheap, and you just inject it, versus screwing a capsule out and putting a new one after 3 mag worths.
You're fine either or indoors, if you do a lot of outdoors, go withi CO2.
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