Amazon.com is known to compete with online retailers from eBay to Overstock.com, but could it be going after the Costcos of the world, too?

The longtime purveyor of books, electronics and tools has quietly expanded into pre-packaged foods, according to online reports.

Amazon now sells everything from Kellogg's Rice Krisipies cups (by the case) to an individual Ortega taco kit.

The Seattle company introduced a gourmet foods section in November 2003, but it was reserved for higher-end items such as Russian Beluga caviar and Comte AOC cheese.

The company didn't immediately return a call for comment.

Because Amazon sells products from third-party vendors alongside its own offerings, it shouldn't surprise us that two taco kits were available under its "used and new" section.

We'll just assume the boxes are unopened.