I'm in middle Tennessee, R-12 is $37.00 for a 12 oz. can here at a local parts house. I've heard rumors that it is double that (because of local taxes) in other areas. I stashed a little back when it was still cheap
Saw some recently at an auto swap meet(Carlisle, PA) the fellow wanted $600 for a 30# cannister. Probably a good deal.
Good luck
Al