For example, in 2004, a copy of Flash Comics #1 (January 1940), the first appearance of The Flash, was auctioned for $42,000 and a copy of Captain America Comics #1 (March 1941), the first appearance of Captain America sold for $64,400. In 2010, another copy of Flash Comics #1 sold privately for $450,000.

The first appearance of Superman, ''Action Comics''