If it's new and has never been mounted, I'd say around $800-$900. I wouldn't buy it as I have no use for a scope with that high of a magnification, so it would depend on what a person would want it for.
Just keep in mind that once you get past 16x or so, you really start to notice optics quality and a dim view at low light. I've had a 2.5-16 Elite 6500 and while it was OK, it wasn't great. In other words, don't expect it to be as clear as a $2000+ scope of the same magnification.