Pricing unusuals is hard because you are depending on a very very small number of people that have the cash and the desire to buy it.
Some months there may simply be no one willing to buy your unusual, and other months there may be 5-10 people lining up to bid on it.
The only way to get an "accurate" price is to auction it off. But generally flaming is a desirable effect. I would guess it would sell for at least $150.