Auburn is an awesome show. There is alot of petro items there in the swap meet area.
Ohio Oil and I usually spend about 4-5 hours just covering the swap meet.
Prices usually run a little bit higher than other petro swap meets, But there us usally a few good deals to find.
It is also an experience to walk up into the auction rings, any car you can possibly imagine is there being sold. Duesenburgs,ferrari,Lamborghini,model T's. One year while looking at the vehicles about to go into the ring, I came across the Wagon Queen Family Truckster (from the Chevy Chase movie Vacation). Alot of unique stuff there.