I think you must have been given some wrong info. Heck that is scuba tank size and the cost is high for refill mostly due to labor cost I would think. I would check as many LWS places as you have in Pine Bluff to verify. The 125 CF is about as small as I would want for O2. The 75 on the acetylene might be ok if you dont use a rose bud a lot for heating. A propane weedburner torch from HF does a good job of heating if you dont mind heating a large area.I've been told the largest owner cylinders in my area are 80³ft. I have a 75³ft acetylene, and an 80³ft oxygen. The oxygen is $24 for a refill, and acetylene is $48. I average about $100/ year using 2 oxygens and 1 acetylene. I only use them if I have some long cuts in 3/16 or thicker steel. A 4 1/2 inch angle grinder just doesn't have the guts to do it fast enough. Not to mention if the cuts are long enough, I'll go through a few discs.