A Minneapolis man renovating his home recently found what is considered to be the Holy Grail of comic books: "Action Comics No. 1" from 1938, the issue that Superman makes his debut in.
Bing: More about 'Action Comics No. 1'
The AP reports David Gonzales found the comic book mixed in with old newspapers insulating the ceiling of a house.
After doing some research, he confirmed the comic was valuable. Unfortunately, Gonzales got into a heated discussion with a relative about its value and the back cover was ripped.
New York-based online auctioneer ComicConnect.com graded the book a 1.5 on a 10-point scale because of the damage. By comparison, an "Action Comics No. 1" that was graded a 9 recently fetched $2.16 million.
The comic book's auction price reached $137,000 as of Friday afternoon. Bidding closes June 11.