I have been involved in many different swap meets for many different hobbies, but they are all very similar in that the prices the vendors ask for their pieces are always all over the board. Before I head off to any swap meet I always decide what I'm willing to pay for an item regardless of what some "price guide" says it is "worth", I am always willing to pay a little more for the ability to actually look at an item before I buy it, and to carry it home with me that day, rather than have to take the time to go through the process of ordering something, waiting for the order to be processed and delivered, and hoping that the vendor's description of it's condition is close to mine. While I am there I try to do a dry run around the show to see who has anything I might be interested in at the best price. If the vendor's asking price and my willing to pay price are too far apart I just keep going, but if they are close, then the vendor's attitude plays a huge role! If I try to negotiate a price and he growls back at me "NO, where are you going to find it any cheaper?!" I actually have an advantage, because with a few taps on my smart phone I can usually come back with "I just did!!", and go on my way! Anyways, in the end with a strategy and a little patience, I can almost always find items I am looking for at, or below, what I am willing to pay!