Spiderman Twin Towers 35mm Trailer

[TheForce8686]

I honestly don't know which forum to ask this question but it involves movies and this thread gets lots of traffic so i will start here. I have a bunch of movie trailers from when I used to work at a movie theater 15 years ago and am considering selling them because my family needs the cash. Most I can get a guide for on ebay such as Lord of the Rings, Harry Potter, Star Wars, etc.

However, the prize of my collection is the original Spiderman teaser that had him catching a helicopter in a web between the Twin Towers. 9/11 happened and these trailers were removed and supposed to be destroyed. This one wasn't. How much do you think it is worth? How would I find that out other than Ebay? And I am not looking for the "it is worth what someone will pay" answer.

I am asking if other movie fans like yourself think there is some legitimate value in it. I know it is very rare so if 20 bucks is the most I am gonna get I will keep it. Thanks in advance for anyone who can help.