The world's easiest case is not cardboard + contact paper + velcro. It's a mitten or something. Step 1: remove mitten from your hand, Step 2: place Kindle inside mitten. That's easy.
This is cheap, but probably not the world's cheapest. So the title should probably be "an inexpensive Kindle case that will take an hour and a half of your time to make (including finding all the parts) and will be half-decent". I guess that's not as catchy. Sigh.
Came here to say the Uk version of that: an A5 padded envelope from the post office. It's not that durable, lasting about a month the way that I throw it in my backpack, but it costs under £1.
That's a pretty cool hack. I must mention, though, that the Amazon branded Kindle case also has the property of not covering the front of the kindle (for a lot more dough).
This is cheap, but probably not the world's cheapest. So the title should probably be "an inexpensive Kindle case that will take an hour and a half of your time to make (including finding all the parts) and will be half-decent". I guess that's not as catchy. Sigh.