The bargain $3 covers for the Kindle Paperwhite disappeared quick (I don't know if mine will ship, but I did get an order in). Amazon has their own covers available though, for all the new models, with the following color choices available:
Kindle Fire HD 8.9" Standing Leather Case ($54.99) | Kindle Fire HD 7" Standing Leather Case ($44.99) | Kindle Paperwhite Leather Cover ($39.99) |
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There are some 3rd party covers starting to show up. Marware has quite a few in the list of available Kindle Paperwhite Covers and it looks like a number of the covers will fit the Paperwhite, Touch and Kindle (although perhaps not perfectly in all cases). In the case of the 7" Kindle Fire, if you don't want the special case from Amazon that turns it on and off automatically, then there are large number of cases that fit the Kindle Fire and Kindle Fire HD.
Any Kindle accessory purchase will also get you a $3 MP3 credit (limit one per account) -- it'll come via email, so be sure to keep an eye out once your order ships and apply the credit to your account.