I've been to two gun shows this past month. They are small shows, and I'm fairly familiar with most of the regular dealers there. Yes, there are two or three that have a pretty good selection on the tables, all tagged at above MSRP, and they won't haggle any. They evidently sell enough guns to warrant returning every year though.
There are also a couple of dealers there who also have their guns tagged high, but they will deal if you are serious, and make reasonable offers. I think that many people are afraid to try to haggle with a dealer.
Something interesting I have found. Even the reasonable dealers aren't likely to haggle too much on guns that are in very short supply.