E-readers are coming down in price...or "rolling back" per Wal-Mart speak...In the increasingly crowded world of digital readers the competition is heating up while the profit margin may be shrinking.

Ahhh, don't you just love open competition?

Claire Cain Miller, writing from the San Francisco bureau of the New York Times, reports this on the latest Kindle shot in the e-reader warfare: 

Amazon.com
will introduce two new versions of the Kindlee-reader on Thursday, one for $139, the lowest price y...
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