Gun shows aren't flea markets or yard sales.
Generally sellers know exactly what their stock is worth and what they can expect to get for it...especially in the internets world of sales, info, etc.
If the price is less than what it should be you need to be very careful of what you're buying...it it's too good to be true it's probably because you're about to be screwed.
Considering the gun hysteria right now I'd not be surprised at any price I'd see. This is the worst time for a gun hobbyist to be buying anything that may be on a banned list.