Selling a very rare album


Want to get your thoughts. I'm selling my album collection and I have a rare issue from Jethro Tull named "Hand in Glove" that only 500 were pressed according to disclogs and popsike. The album actually has paper glued on the front and back with Ian Andersons face with a slogan on the front and the song names on the back. It is a double album in mint condition. How would you determine or who would you ask how much something like this is worth?
rbstehno
There is a legit 3 lp release of this that goes for about $100. 
Discogs does list bootlegs but they don't allow them to be offered for sale.
If you do list it for sale, make sure that the potential buyer knows it's of poor quality. A hardcore fan would want it anyway. I had a guy send me Gordon lightfoot cassettes years ago. He rated each tape by the SQ. Tapes that I could barely hear, he rated A minus! I don't think I even tried to listen to a tape he rated a B minus. Most bootleg records are of really crappy quality.