The most expensive comic sold to date at auction was a copy of Action Comics #1 for $317,000.
On February 25th, a copy of Batman's first appearance, Detective Comics #27, is to go on the block. It has an estimated price of $300,000. But it's quite possible that Detective Comics #27 may go for more and we'll have a new world record.
It has been slabbed by CGC with a value of 8.0. Heritage Auctions describe it;
This clean, beautiful copy really delivers when it comes to eye appeal. As far as this issue is concerned, most seasoned Golden Age collectors would be prepared to accept any number of flaws, but they will find only inconsequential ones, and none that mar the very strong impression you get the moment you lay eyes on the book. Issue #27's solid yellow background is ordinarily very prone to smudging, yet this copy somehow avoided it. The red block with the Detective Comics logo also discolors easily, and is almost never seen as the solid block you see here without a color break marring it somehow! Also, note the absence of spine splits, creasing, and most other things that are known to mar comic books of this vintage. We can only encourage the prospective bidder to examine the scans of other unrestored Detective #27 copies in our online auction archives to fully appreciate how unusual this copy is.
The comic was bought by its owner for $100 back in 1960.