Used Strength Training Books

where is the best place to buy and sell Quality used training books and dvds.

I see so many books and dvds that i would like to buy but it can get get very expensive. I also have a lot of quality books and dvds i would be willing to sell in order to acquire new information.

amazon and ebay work for some things but the average person does not know quality information when they see it so it can be hard to sell.