Do a search and see what people had to say about it. If people got all mushy over it try and buy it for less. If they didn't don't give more than 200. Chances are it didn't generate a cult like following so don't give much. Just keep stopping in every once and awhile and offer to buy it. Took me 2 years this way once, but it happened.

As long as the cultist continue to sway the minions, they'll be another just around the corner so don't worry about not getting this one.