I am just about to repair my Kindle 3 keyboard 3G, having stripped it down to confirm that screen replacement is easy and ordered a reasonably priced Amazon spare.
Once it is functional, I will be deciding to sell or keep, if anyone is interested in making an offer, I might be influenced. It will come with the proper Amazon self-lit cover (the one that cost £50 originally). It is fair to add that the screen has just cost me £40.
Having stripped it, looked at the screen and how it is fitted, it is bloomin' amazing that most seem to last as long as they do.