In my opinion the best way to find the value of anything is to get a realistic appraisal. To do this list the item on ebay starting at 0.99 and set at unbelievable reserve like $1,000.00. This way you will see what us collectors are willing to spend on your item and it wont sell since the reserve is so high. Take a lot of good pictures. You will pay the ebay listing fees but that's cheaper than paying an appraiser and you are getting a more accurate appraisal. I do this a lot. Usually 3 or 4 times a year for one item so that i am getting realistic numbers to average regardless of highs and lows in a certain market.
"Instruments of Mass Destruction"