Its not worth much. Its very outdated phone. Uses the same hardware as the first android phone from 3 years ago.
The droid eris is still a worth quite a lot verizon is doing a trade in program and the eris is worth 132 to then and the droid x is only work 90 for some strange reason
Well there are 4 refurbished ones on ebay right now, most have a buyout of $150, starting bid of $0.99. None of them have bids. Hard to tell.
Edit: there is one that is not refurbished ending in 6 minutes @ $103. So i'd say $50-75.