After briefly chatting to my co2 guy, hes interested in running a refill service via carrier. Hes thinking of the following deals at the moment. 1) A normal refill service. 2) A rental service for those with out of date cylinders or no cylinders. 3) Re-certification on out of date cylinders (possibly). Hes checking out carrier prices and the other logistics.. for instance, carriers have to have a license to ship compressed gas. Once he's come back to me Ill keep you all updated on this thread. If all goes well, we should have a mail order co2 refill service at reasonable prices including shipping that can turn around in only a few days, no matter where you are in the country. He's likely to be very competitive. Anyway, watch this space.. Ill keep you all updated. cheers..