Protective covers for electronics are always way overpriced. The method I use to protect my Kindle 4 and Kindle 3 (Kindle Keyboard) costs less than $1.
I just use padded envelopes (bubble mailer envelopes). The 6″ x 9″ (inside dimensions) size fits both the Kindle 3 and Kindle 4 perfectly. I bought a new one today for my Kindle 4 and it cost exactly $0.95 including tax.
Here’s what they look like:
And here’s a quick video of me talking about using these envelopes as Kindle covers:
Better than paying $35 for a case, eh? I mean, think of all the cheap Kindle ebooks you could buy with that $35!