So, I'm kind of stuck between Tractor Supply and Airgas.
Both have purchasable cylinders up to 125 (#4), Airgas wants $270 and TSC wants $320. Airgas is $37 a fill and TSC is $50 an exchange.
The big difference is TSC is about 5 minutes from here and is open on the weekends, Airgas is a 45 minute drive, and I'm not sure if they'll let me load it in the car (TSC is close enough I can get any of 5 neighbors to run it in a truck if I need).
Airgas rents/leases larger, but they want $35 to deliver and approved credit (the last year's issues have destroyed my credit).
So a practical question for those who do moderate weekend welding, couple hours of 'on time' a weekend let's say. How long does a bottle last? Does the math work out if it's 10-15cfh and a 125 bottle does that mean I'd get about 10 hours of runtime?
I'm trying to factor in gas, convenience, etc. $13 a fill plus $50 up front difference to stay close to home, how often will I be filling/swapping?
The difference at TSC between an 80 and a 125 is $40 cheaper on the bottle and 8 cheaper on the fill. I don't really see that being worth it, though an 80 would be easier to haul out to some jobs (like the trailer repair, which hopefully won't be the last) I was thinking maybe a 40 or 80 and then another 80 or larger down the road to get in cheap now and have something portable.
Thoughts (besides just 'get the biggest bottle you can', I already realize that part )