TheMailMan
TGT Addict
Margins on guns are razor thin, other stuff, ammo, holsters, mags... Thats where the money comes from. The average markup on a serpa holster is like 150-200%. The markup on promags is probably pretty close. Ammo has got a hefty markup, but not near as much
Lot's of shops will sell at gun shows, or gun broker. Of course what is usually the case, they're about to go under.
The markup on ammo is a lot less than you think it is.