Some local places will pricematch........I got TiresPlus to knock like $30 bucks a corner off just by telling them Tireracks price. Their price wasn't quite as good as Tireracks, but it was A LOT cheaper than the price I was originally quoted. It is worth a shot.
Also, if you are not necessarily looking for a specific tire, Sams Club (maybe even Costco) has good deals on tires.
Good luck!