Radio Shack and pawn shops are the only places that sell scanners in Lafayette that I know of. I wouldn't buy one from a pawn shop because the scanners they sell are usually old beat up models that are way over-inflated in price.
If you want a brand other than Radio Shack, like Uniden, AOR, Icom, etc., you will have to order one. There are plenty of internet dealers for these brands.