Sadly I dont think we have any retro game shops. And I live in New Orleans and still none. Whats the name of these shops you speak of? Maybe I can contact them for mail order.
the specific shops I go to are videogames etc and Disc replay. neither of these places to mail orders but you can try calling around to all the Mega Replay maybe an owner would consider it to get rid of the undesirable games they have too much of.
and to further help you out I just did a quick search through yellow pages in new Orleans and found these 2 shops. couldn't tell you prices or inventory so you will have to call them up/go to the shop to see for yourself.
Gameloft
365 Canal St Ste 480, New Orleans, LA 70130
(504) 528-9261
Play N Trade
5300 Tchoupitoulas St, New Orleans, LA 70115 - location 1
1615 Poydras St # 1020, New Orleans, LA 70112 - location 2
(504) 895-2185
says they deal in retro
there are a lot more listed but most of them look like video gambling places. hope this helps you.