Apparently there's a newly opened up GameXchange store in New Iberia. I only found out after stopping at the Alexandria store on my way back to Shreveport, one of the managers told me about the place. But I had checked Google Maps before driving all the way down there, and there weren't any new game stores I wasn't already aware of. I had to go to the GameXchange website to find its location. Who knows when I'm going to be in the area again to check the place out.
I think I've been to the Play N' Trade in Prairieville. On another one of my day trips from the Shreveport area, I went down to Baton Rouge to check out the Prairieville Flea Market of Louisiana, thinking that it looked so big on Google Maps that it should have something good. And I was wrong. On the way back I stopped at that Play N' Trade, along with the two Gameware locations in town. Don't remember finding much there either. A bit of a wasted trip.
As far as imports go, the only place around Lafayette I've ever found them is at the Jockey Lot Flea Market in Carencro, and that's only Super Famicom cartridges. You've probably already picked that one clean, there's way less SF carts there in comparison to the first time I visited them.