Another consideration is that Costco includes tire insurance with the price of the tire, whereas you have to pay something like $30-$40 extra per tire at Tire Rack. I did the calculation and even with CA tax, Costco came out to be significantly cheaper if you take into account the insurnace and the cheaper mounting/balancing costs.
As for trusting them with mounting/balancing, I've seen good and bad reviews for costco tire installation - it depends on which location you go to.
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