Opinion on a Tasco 25T Spotting Scope

[Ultraman]

I have a Tasco 25T spotting scope that I purchased several years ago that came with its 'World Class' model tripod and a 20x-60x variable screw on lense. I am trying to obtain the value of this as I wish to sell it. I only found one place on the web that had a 25T and they wanted over $500!! This can't be right....is it? Any thoughts or opinions of what I should ask would be appreciated.