My tank went dry yesterday, so I went to get it filled (or exchanged) today, as I didn't want the tank to be without Co2 for long. This tank lasted me almost 2 yrs (filled in April - May '05), but I distinctly remember it costing around $23-24 to exchange an empty 10 lb'er for a full one. I went today and they rang it up to $30.38 -- that seems pretty high! This was at Harris Gas/Welding Supply in Citrus Heights. I tried calling Praxair, but they only have 5 lb and 20 lb sizes. Not that it matters now, since I have a full tank, but does anyone know of a cheaper place to refill in the Sac area? This may help benefit others as well, who may be looking for a refill station.