Walmart vs. Amazon, it's war!

Walmart fired a deafening shot at Amazon.com Thursday, announcing plans to sell 10 hot new books for just $10 at its Web site, Walmart.com. Yep, that's right, hardcover books from bestselling authors like Dean Koontz and James Patterson for just $10.

And here's the fun part: When Amazon said it was matching those prices, Walmart dropped its prices again, to $9 per book. It's a price war on the tallest order. (You can already preorder books).

"If there is going to be a 'Wal-Mart of the Web', it is going to be Walmart.com," said Walmart.com CEO Raul Vazquez in an interview with the Wall Street Journal (subscription required). "Our goal is to be the biggest and most visited retail Web site."