When R12 was being phased out, the price skyrocketed. Since then it has come down quite a bit since there's only a few cars and equipment left still using it The hard part is finding a shop that still has R12 equipment and an R12 qualified technician. I have a local 76 station that specializes in repairs to older cars and they do quite a bit of R12 A/C work.
You can still buy the small cans of R12 at auto swap meets. here in CA. Illegal to sell to a unqualified person but who's checking.
The older transit vehicles from my former workplace originally used R12 and after we converted to 134 I was able to buy a surplus 30# bottle of R12 fairly cheap. Came in handy for my ElCo. Installed a new compressor 10 years ago and its still blowing 38* from the center duct.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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