Logan's Run in Good sells for $200 bucks

Here is an example of a real sleeper book.  First, it is a very hard to find 35 cent variant of a minor title which makes it even tougher.  Second, it has a back-up story which just happens to be the first solo story of Thanos.  Thanos is going to be the main protagonist of the next Avengers movie so this is a very important book.  This is also why a beater copy of this book would bring $200 bucks at auction.  Watch what happens when the movie comes out.