You need a MACS license (a test is involved as well as a card being issued) to purchase, service and distribute R-12. We use it all the time in many of the older private/corporate jets and the systems are still serviced on a regular basis throughout the aviation world. Last 30# I bought was $1230.00
All you can buy if licensed (legally) is recovered and re-manufactured, but it is still available at many HVAC wholesalers. There have been allegations that the French are still making the stuff and selling it on the black market- there have been several busts on the stuff coming into port in the state of FL in disguised containers.

Sam:
What years was this system used?
Ed

I have shipped 30 lb bottles USPS marked as freon and it wasn't that bad to ship. Just ask at the post office how to mark it and send it out. I convert my stuff to 134A works fine I have some R12 left sell it on EBAY the licence was easy to get.

I have a MACS license and wouldn't bother with R-12. I've converted many systems to R134A and never had a problem. It's very cheap and works very well. Maybe with aircraft it wouldn't be worth changing but most cars its not worth purchasing the R-12.

Getting the license was actually a joke- extremely easy test and some paperwork to fill out. I can't even remember now how many years ago it was- maybe 10 or 12? There's hardly any need for it anymore in the automotive world as these older cars are either crushed or converted.
The aircraft industry seems to always be left alone when it comes to chemicals that are deemed hazardous- I guess since it's a relatively small cross-section of transportation in relation to ground travel and it has it's own governing body (the FAA).
Conversions to aircraft have to be done with a Supplemental Type Certificate, and those individuals or companies that do the research and paperwork to develop the kits have to get it approved by the Feds. They also have to accept the liabilities that go with anything stamped 'for aircraft use'.
What costs $39.95 at AutoZone for an older vehicle conversion can cost upwards of $15K to buy the kit and required STC paperwork to convert an aircraft. I inspected one on a Falcon a few months back and I think it was around $14K for the kit plus labor.

The card is a joke not like a master trademan's card, just listen to boring lectures and take the test.

I have one 30# can R-12 sitting in the garage.

$500 and it is yours.

Call Alan Jones 856-589-1070