Todays Phoenix, Az owner bottle exchange prices. 55cf $32.00 80cf $39.00 125cf $52.00. I have a 55cf and want to keep it and buy a 125cf but it's $207.00 full. I figure for now I can refill the 55cf 6 times and get 330cf for less then the $207.00. (Is my math right??) I don't need to exchange that often but even when I do the welding supply is just a few miles down the road.