Just to wrap the thread up, I ended up getting R-12 from TRS Sales, www.trssales.com. They charged me $26/can plus the shipping cost. I got the EPA 609 certification from IMACA (www.imaca.org), for $15.

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Gabriel
'91 350SD 162k
'83 300SD 210k - rear-ended and scrapped
'84 300SD 210k - totalled