I've been to Tire Depot a couple of times. I have purchased both new and used tires from them and my experiences were great. Their prices are reasonable, and they were very polite. I also liked the fact that I didn't have to wait hours to have the tires put on my vehicle.
I've been here a couple of times when the budget was tight. They sell used tires that still have a lot of life left in them. The tires are different brands. I think they were $25 a piece. I've also had them plug a tire for me before. They'll even put them on for you without you getting out of the car.
PROS: price and convenience