Forget about Tulsa. I spend 1 whole day before the gun show up there going to many of the pawn shops and guns stores, nothing there. Several I called ahead of time and told them what I was interested in, no luck.
There is Sportsworld that is a very nice shop, but most of the times I have been in there, they have a few used gun, and lots of new ones. They deal mainly in Beretta and Browning and the like. So if you want a current production gun, go there. I think the highest grade gun might be a Grade 7 Citori or a Beretta 687 EELL. Lots of nice clothes, accessories and such, but seems to be priced at full retail. If you are looking for used collectable guns, I do not think you will find it there. I have not. Nice folks.
Best
John Boyd