Someone will be able to give you a lift to a local store. Ask at the Info Desk when you arrive and maybe they can assist you in tracking someone down. I'd help, but I don't know if the rental I have is big enough to hold a table. Still, it shouldn't be impossible to get one once you're in town.
I would also check to make sure that you can bring in your own table. Might want to ask Craige, the Vendor Coordinator, if that's allowed. If so, then I don't see that you'd have much problem getting one. Heck, if it's ok to use an outside table and you cannot find anyone else, track me down and I'll see if I can help.
There's a
Wal-Mart at 700 W Mockingbird Ln (Love the street name) which is about 3.5 miles North of the Hilton (right (N) off of Irving Blvd).