Amazon.com announced its 3G Kindle will now have an ad-supported, slightly discounted version, too. (Mike Segar/Reuters)

Not to be left out of the announcement race, Amazon revealed yesterday that it will begin offering a cheaper 3G Kindle with ads for $164, which is $25 cheaper than its predecessor.

Amazon is undoubtedly trying to capture some of the success it had with the $114 “Kindle with Special Offers,” the ad-supported e-reader that’s now the online retailer’s top-selling Kindle.

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