You're in Toronto,
If you know the guys, they'll do it for free, if you don't it's $5 a fill. (Defcon) badlands, rippleindustries, next i'm sure do it too, for the same price.
You can just buy a big ass scuba tank, that'll fill your tanks like 10 times, it's about $20 to fill at a scuba shop, tank itself is 100-200 used/new, but you'll need the tank filler thing from ninja, $60?
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