PAYMENT TERMS All items must be paid for at the night of the auction in which they were won. We accept cash, personal check, Visa, Master Card, and debit cards. A 10% Buyer's Premium and 6% PA state Sales Tax* are added to all items sold. Here's an example calculation of the Total Sale Price: 1. the knockdown item price. 2. buyer's premium (10%) 3. Pennsylvania state sales tax (6%) *unless you register your tax-exemption number with us.