Summarize this article:

Run a quick internet search for businesses in your area. These shops make their money by repairing and reselling old tires, which means they’re just the kind of buyer you’re looking for. While you’re looking up retreading shops near you, read some reviews to see what kind of experiences other customers have had dealing with them. Don’t just promise your tires to the first name on the list. Call up several different shops and ask what they’d be willing to pay per tire. By shopping around your options, you’ll be able to maximize how much you walk away with.  Most of the time, standard passenger tires are worth around $1-1.50 apiece, while larger truck tires can go for as much as $40 per casing.  If the shop doesn’t advertise a fixed rate, try haggling a little by dropping hints to the salesperson that another shop has offered you more. Find out how many tires the shop will buy in one transaction, and if they have any restrictions in place regarding the age or mileage of their inventory. You can save yourself a lot of trouble by making sure the conditions of purchase are clear upfront.  Some shops may only accept newer tires or those with a minimal amount of wear and tear. If you have a lot of tires stored away (usually 100 or more), the retreader may send someone to pick them up themselves, sparing you a separate trip. Once you’ve made your first successful sale, consider returning to the same shop for all of your future business. They may be willing to offer you a special rate if you’re a dedicated dealer. At the very least, you’ll know that you always have somewhere to offload your unwanted tires. Tires tend to be in the most demand in late summer and early fall, when retreaders begin gearing up for the treacherous road conditions of the winter months.

Summary:
Find a local tire retreading shop. Compare offers to get a better price. Ask for details about the consignment process. Establish a good relationship with the tire buyer.