Trade in a well-lit public area permitted by the organizer, ideally near staffed tables rather than in a parking lot. Keep your cards in your control until both sides agree, and move only the cards being discussed onto the table. State the proposed values and any cash difference plainly. For expensive raw cards, inspect front and back under good light; for slabs, verify the certification number on the grader’s official service and compare the holder with known examples.
Use the events calendar to find organizer information and review rules before attending, because some venues restrict attendee-to-attendee sales. Photograph valuable cards beforehand and carry only what you intend to trade. Do not let a crowd rush the final check: count money, inspect the exact cards returning to you, and confirm no holders were swapped. The card-show guide provides broader preparation advice, and established local card shops may offer a safer setting for a complicated deal. If authenticity, ownership, or pressure feels wrong, stop. Missing one trade costs less than trying to recover a card after an anonymous attendee leaves.