There is a guy selling CZ 82's at the Harrisburg G/S and he has mags for about $40 each. You can also buy Promag 10 rounders for about the same price. I have both and the promags work just as well as the original.
Checking out the PA. guns shows is the only way that's worked for me. I buy CZ-82 mags whenever I find them which is only occasionally. Sometimes they're in the boxes of odd, loose unidentified mags marked $10