Each dealer is independent–there’s no checkout like a grocery store–pay each dealer separately for your purchase.
Have a list of what you’re looking for. Most dealers know what they have.
Bringing in a small amount of records to try to sell to a dealer is OK and coming in to see if a dealer wants to check out the records you have in your trunk is also OK. But selling records out of your car to the public is NOT OK. Our dealers pay for their space.