I'm not from Vegas, so I'm not sure how close it it, but I remember seeing a video break from these guys where they pulled the Ruth/Dimaggio Cut Auto booklet from TTT:
Legacy Sports Cards
8125 W Sahara Ave, Suite #160
Las Vegas, NV 89117
Phone #: (702) 341-6525
As for the Pawn Stars shop, when we went 2 years ago they didnt have hardly anything sports related, other than a handful of Super Bowl rings that had 100k price tags. It was being expanded then though, so it may be worth a shot. Don't get too enamored with the place, as they give you a 30 minute limit for staying and browsing. Good luck!