What's a used PS85 worth?


I would like to sell some of my PS85s now that I will definitely buy another racket. I have five, bought two from TW in 2006. The latest models are the ones I would like to sell. They're in good shape, hardly any scratches, like 95% new. For how much should I sell/offer them?

Sorry if this is the wrong board for this question. I didn't know where else I should have posted this ;)