Yes! I have encountered that problem before. A "Car Boot Sale" in the UK is when anyone can turn up, usually to a farmer's field in their car, unload anything they want to sell onto the ground or tables, and sell it to anyone who turns up to buy. They are generally well advertised and attended, and people sell anything from old clothes and toys to valuable antiques and heirlooms. (A "car boot" is what the Americans call a "trunk".) I believe you would call it a flea market or table-top sale over there. We have flea markets here too, but they are usually an upgrade from a car-boot as there are more dealers than private households
I do car boots and flea markets most weekends - both buying and selling - and make enough to be interesting whilst adding to my coin collections.