to answer the original poster's question -- the buyer's premium is a surcharge that the auction house imposes on the buyer, on top of the closing price. So if the BP is 15%, and the closing price (ie the hammer) on the card that you won is $100, then the auction house will charge you $115. Be mindful of this when placing your bids -- some auction websites post the total price pretty clearly (and thus make it easy for you to know your true final cost) while others only post the bidding price (and thus leave it on you to figure out the BP, which makes the auction seem more attractive to you since the posted price seems lower).
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collecting T206, 1940 Play Ball, 1947-66 Exhibits, and 1952 Bowman. e-mails preferred over PM.
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