I've seen the catalog before... my original "want" was for a list of wal-marts that sell firearms. Not what firearms they sell. Curious, because I haven't seen anything more than muzzle loaders and air rifles at the ones I've visited locally.
Sry Mr. JAG misread your post then. Not sure there is a list/db of wal-marts that are equipped/allowed to sell firearms. Being as any wal-mart can order from the special firearms catalog I would venture to say any wal-mart can sell you the firearm provided they have someone who knows the process (ie. might have to be the actual store manager for those stores that do not sell firearms).
In those case it would probably be up to the store manager if s/he wants to go thru the process of doing the special order.
Best bet is to go to the wal-mart website enter in your zip or the zip of the area you want to look at. Get the list of the wal-marts in that area and start calling asking if they sell firearms. if they do then you have a very high/good chances that they will order from the special order catalog for you. If they don't then only the store manager (main one) would be able to advise.