Up for bid on eBay is this 1940's D143 Superman Bread Card #8.
The seller says, "A tough to find Superman issue."
Think of all those people in the 1940s munching on a slice of cheap white bread, worrying about how to save for their retirement, as they toss this future collectible in the trash bin. If they'd saved a a few hundred or so of these bread cards, at the rate this one is selling on eBay, they'd have been all set today.
To investigate this bread card further, click the link provided above.