Wal-Mart's decision echoes a similar one made by Target last May. Some analysts say both companies are viewing Amazon as more of a competitor.
Following in Target's footsteps, Wal-Mart has announced it will no longer sell Amazon Kindle e-readers and Amazon Kindle Fire tablets.
Amazon's new lineup of devices includes a Kindle Fire tablet with HD and other new features as well as a back-lit e-reader called the Kindle Paperwhite.
Kobo is launching a new tablet and e-reader in an attempt to wrest the market away from Amazon and Apple, both of which will probably release new tablets soon.
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Amazon has scheduled a press conference for Sept. 6. Smart money says a new Kindle Fire tablet (or three) is on the way.