I have purchased all the tires for the many cars I have had. They also offer a great deal on brake work and batteries with up to a 7 year warranty on most services.
If you aren't from the NW you may not be familiar with Les Schwab. They used to give away free beef years ago to customers, kind of a NW tradition. The service, warranty, and additional support they supply for their shocks, struts, tires, and rims are unmatched by dealerships or small mechanic shops. I have taken every car there since I could drive for those four purchases.