If you have a collection of old comic books in your basement, it might be time to dig them out.
Several recent big-ticket sales bolster the belief among several analysts that collectible comics are becoming a viable alternative investment for some people. (Warning: if your mother threw away your collection, stop reading.)
One example: In 2011 actor Nicolas Cage sold the most expensive comic book ever, one of the 50 copies of the 1938 "Action Comics" No. 1, Superman's debut. The price: $2.16 million, for a copy was once sold for only 10 cents.
Another copy, which is considered to be in better condition, is up for auction on eBay. and is expected to break the record for the most expensive comic book ever sold.
In May, the first Wolverine comic art, "The Incredible Hulk" No. 180 sold for $657,250 at an auction. In 2012, an original Spider-Man piece "Amazing Spider-Man" No. 328 by artist Todd McFarlane sold for $657,250.
And eBay says it has had $4 million in comic book sales so far this year, 14 percent more than last year.