Some discount tire stores stock and sell used tires, especially underused OE tires. They are from customers who want to switch immediately to another one. Some come with low rolling resistance tires and mileage may be compromised if tires are changed. If this were in a high-performance car or one that was used on the track from time to time, there could be some justification for changing tires, but in a driver's daily purchase, going to the supermarket, new tires is a waste of money in my opinion.
If you search Craigslist for tires among the auto parts for sale, you'll no doubt find used tire dealers. Big Industrail tires can give you pretty good credit. Before, you could sell good cases to reusers, put them on Craigs List or on the local bulletin board (I bet you want to keep them long, if you sell them, for example, in half at retail), I have no qualms about buying tires like that, and I'm also an avid recycler.
