In my opinion, it would be worth it if you are going to buy. Definitely look into which breeders will be there. Basically, you'll be saving a $40-50 shipping cost. You could also pick up some feeders while you are there. They'll most likely be cheaper than what you'd get at a pet store, and again, no shipping costs.
With the money you'd save, it would be worth the half-tank of gas.