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Do any Boston area DGC have advice on where to fill Co2 tanks for less than $25? That Way To Grow ad with the cheap Co2 deal always has me thinking that there is a cheaper way to do this. Ideally, I’d like to bring my tank to get filled rather than swap it for a full one like I’ve been doing. I’ve looked into some brew stores but haven’t found one that will do it. I also would want to make sure that it’s beverage grade Co2 and not the welding gas some people use.