I don't know about Canada not allowing green gas, but that's not really why we use propane. We use propane because green gas is (unsafely) repackaged propane with some minor additives and 3x the price.
1) BBs and gas (silicon oil if using propane)
2) Get a propane bottle from any hardware store, it'll be painfully clear
3) See 2; ~$5
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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