What is the depreciation on good used speakers these days? I've got a Boston Acoustics VR-12 Center Channel (VR12 Lynnfield, Dual 6.5" full-range, 4.5" midrange, 1" tweeter, 250 watts) that's in perfect condition (not even any noticable scratches) that I paid $400 for 18 months ago. I'm moving into a new house this coming weekend and have decided that I really want to replace this speaker with the newer B.A. VR-MC in cherry to match my set of four VR-M50s. My dealer says that he can't offer me a trade in on the VR-12 since it's been discontinuted. I need to sell it to offset that $600 cost of the VR-MC. I'm wondering what would be a fair price to ask for a used VR-12? Is there any online pricing guides for used speakers? Or anything like that? Thanks for any suggestions or guidance.