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Like ak_Stalker said, you can get an adapter and use propane (like the Coleman camping canisters) as green gas since it's the same gas except different smell added, and you have to add the lube yourself. You can pick up an adapter from airsoftparts.ca or directly from airsoft-innovations.com
HFC-134a is getting harder to find, since most dusters have switched to HFC-152a (Difluoroethane), which doesn't offer as much pressure. You can still find some dusters that use HFC-134a, though.
For duster you'll have more luck in hardware stores, computer stores or camera shops, or even WalMart and Zellers, than hunting/pball stores. Propane you can get at Canadian Tire and is frequently on sale.
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