I can add a few more shop experiences in the area.
Nick's Gun and Pawn (Washington, MO), had a TON of inventory for a small shop, met Nick the owner, great guy, very willing to help you find what you're looking for if they don't have it. Very good prices. I wouldn't hesitate to buy from there.
Pacific Guns (Pacific, MO), little stand-offish at first, but once they get a feeling for you they're good guys. Met the owner Nick (ironically the same name), great guy to work with, he's willing to negotiate a little on price, told him I found a better deal at the shop in Washington, he dropped his price to match. Would also buy from there again.
Stone Ledge Gun and Pawn (Washington, MO) - had a good amount of inventory, seemed disorganized and dirty, I was in the shop for at least 30 mins, no one ever acknowledged I was even there, so I left.
Denny Dennis (Fenton, MO), good selection, prices seemed a bit high, decent staff though.
Definitely going to the NRA Convention this year!