Where to buy tires

Have you tried looking at Tire Rack?

They've got a very good selection of wheels and tires and an interesting feature is being able to pull up a photo of your vehicle (in most cases) in your color (usually...) and see what the wheels would look like installed. I recently bought a set of tires online from Tire Rack and was very happy with the outcome--only tires, no wheels. They have several warehouses across the country so they can ship quickly.

Good luck!