Dan,
If it is Saturday only for you, get there by 9am. Start at the silver and blue halls as they are next to each other. Walk up to purple which should not take much time to look through and go to red which is nearby. White is next to red. Folks are willing to deal on a Saturday. Many have signs saying that, some have 50% off signs on their tables. You just need to know what you are looking for and have a feel of the price you are willing to pay for a certain piece. I've done well on Saturday. Had a gentleman beg me to buy his MTH turbine which I bought.
Those 4 halls in that order would be my suggestion for someone looking for postwar. Once you hit those, you should have time to navigate the Orange hall, very, very large hall.
As for folks buying, I always price stuff to sell. My comment back is that it is quite reasonable. Want to make a low ball insulting offer, I'll just keep the piece or like some said, throw it on the floor, break it and tell the bottom feeder, now you can have it for your ridiculous price.
Dave, $275 for a Hellgate bridge? Excellent price. Wished I had layout space for one.
Just my 1 cent worth! Lol!