Whether you are buying from a local shop, a vendor at a convention, or someone online, not every seller has your best interest in mind. Here is how to tell the good ones from the ones to walk away from. They let you look without pressure. A good vendor is happy to let you browse, ask questions, and think about it. They are not hovering over you trying to close a sale. They explain their pricing. If you ask why a card is priced a certain way, they can tell you. They reference recent sales, condition, and market trends. They are not making numbers up.