Rare Superman comic found in house insulation

It's considered the Holy Grail of comic books: Action Comics No.1 from 1938, featuring the debut of Superman. And David Gonzales found one mixed in with old newspapers insulating a wall in a house he was renovating in a small town in Minnesota.
Gonzalez did some research that confirmed the comic was valuable, though not as much as it could have been. He got into a heated discussion with a relative about its value, and the back cover got ripped.
Because of the damage, New York-based online auctioneer ComicConnect.Com graded the book a 1.5 on a 10-point scale. By comparison, an Action Comics No.1 that was graded a 9 recently fetched USD 2.16 million.

Bidding on Gonzales' find was up to USD 127,000 as of Friday. Bidding closes June 11.