Thats funny I just had mine filled yesterday. I go to Colorado Welding Supply, they fill it while I wait and charge my $16 for a 10 lb bottle. They are open saturday also. They are off 8th street and hwy 24. address is 855 garner st
phone 473-7714. I called everybody and couldnt find anything on the north end. However there is a homebrew shop at vickers and academy they will swap out your tank for a filled one, it costs more and you might get an ugly tank.