If you bought a Kindle Keyboard 3G (aka Kindle 3) recently you may be looking for a case. Personally I had bought one from Best Buy recently- I thought it was a good value for less than $100 w/ 3G full internet access to boot (albeit in black & white). Being very thin the Kindle Keyboard definitely needs some sort of protection. Looking around, a new one with light from Amazon costs a somewhat eyebrow-raising price of $50. But right now Amazon Warehouse is selling one for just $21.99. It's "Used - Very Good" condition, but if my past experience with buying from AW holds true, it should be in excellent shape. Free 2 day shipping if you have Amazon Prime, otherwise you will need to add $3 of items to get their super-slow (er I mean Super-Saver) shipping.
BTW for 50 cents more, you can get the "Like New" cover, which is what I ended up doing.