Sorry Will, I didn't see anything about your OTR, so I was going a different direction!

Like Jon said, if you can stay with R-12, I'm still finding it reasonable. I had just bought a 2nd 30 lb sealed can for 200.00 before leaving for OKC. I carry gauges and R-12 with me just in case.

Jimmy C has some R-12 that may still available.