Fantastic Four #1 comic book from Marvel Comics Group
This is the issue that started the silver age of Marvel or so they say.  It was the beginning of a remarkable run of comic hits.  With Spider-Man, the Hulk and X-Men to follow, Marvel really was in its golden age.  But one thing that surprises me about this book is that it is very rare and very expensive, but you can look on ebay at any time and find a stack of them for sale. 

       

This is a scan of an old comic book. This item is not for sale. But you can find it on ebay.
Click below to go to ebay and search!