...I'm in Canada, where, at least in my region, we need A/C for about 1 - 2 months, if we're luckey. (LOL).
My 85 350SE's condenser was shot, so I hesitantly phoned for an estimate on conversion and replacement. (As you may know, R12 is like heroin here, you go to jail if caught importing the stuff! But I digress...)
I followed many of the threads here on conversion. In the end, it cost me $530.15 CDN (about $400.00 USD) for a new condenser and a full charge with something called 'AC-Freon R414B (59)'. So far, it's worked fine, and I thought the price quite reasonable.

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1986 560SL
2002 Toyota Camry
1993 Lexus