[perezfan]

I would avoid eBay completely and go the auction house route. Any reputable AH will know if it's authentic or a repro. Stick with the major/established ones like Leland's, Hunts, REA, LOTG, SCP, Heritage, etc.

Buying them in multiples is a great way to mitigate the cost. You used to see a lot of press pins offered in group lots, but they're getting tougher to find.

Best of luck.