Interestingly enough, i didn't actually pay for my first page of OA. It was a gift for middle-manning a deal between two friends. A Herb Trimpe unpublished pin-up from GI Joe #1.
http://www.comicartfans.com/gallerypiece.asp?piece=481974
The first page i ever bought sucked in comparison...Avengers Spotlight #23 pg 4
http://www.comicartfans.com/gallerypiece.asp?piece=481978
Love the series, still to this day, but the page isn't so awesome compared the Joe pin-up. The nice thing about this page is that it taught me to be more selective when buying in this hobby and not go all out buying whatever and everything, which is how i approached other hobbies in my youth.