I have a set of 1996 volume 2 #1-13 Captain America comic books, 2004 Captain America and the Falcon #1-8 they are in factory sealed packages and never opened. Researching ebay I found one comic was offered @ $12.99 buy now, I would like to know why I am having trouble selling these items as a package for the same price? I also have other in sealed packages any suggestions? Thank you :)