Where to sell my unused one-piece clip ins

I recently bought clip in human hair extensions from YourHairShop. It's a one multi-level contoured piece (like Jessica Simpson's HairDo). The clips are too big for my fine thin hair. YHS return policy states that I can't return it for exchange if I take it off from the cardboard backing hence everything is in it's original state. I don't really need anything else from YHS for exchange so I'm left with no choice but to sell my clip-ins for a loss. Do you know of any site (besides Ebay) where I can sell it? Thanks.