Replying to Head Mojo 90

I have a friend trying to sell a pair of '05 Mojo 90s.  He wants me to quote how much they are worth but he doesn't know a lot of the info so I was hoping you could help out a little.  Here is what I know:

-Never hit a rail, topsheets are a little chipped
-Mounted once (not sure where or what binding though)
-Have about 30 days
-Don't know what size but I am pretty sure about 175-180


If you guys could give a really general ballpark that would help because I have never seen these.