Smokey
I purchased a blued ROA at a local gun show for under $400. I was able to look it over and see that it had just normal wear and tear, no rust. Bought it, fired it, worked fine.
There are several gun shows each year in my area. Just a few muzzleloaders at each show. Never know what your going to find. Underhammers, hawkens, custom rifles and pistols, shotguns. I usually ask to run a patch down the barrel before I buy. I bring along a bore light and oiled patches, jags. I only buy if the price is reasonable and there is no rust or bulges in the barrel. I still look at the expensive ones but do not buy. Its fun to go to the shows even if you don't find a bargain.