I have one in a little better shape and am having a hard time finding a value as well, before I list it for sale. One company "Brians Toys" offered me $4, which I find a bit ridiculous and would never part with it for that price. I realize based on your post date it's been a while since you posted this, but did you ever find a buyer?
My aunt worked for The Egg Company,Universal City, CA (Lucas/Spielberg Business Office Bldg pre-Skywalker Ranch move) and gave me some awesome collectibles. The Vintage items I own/ and or am selling are from my personal collection from childhood.