Well I just got the back that was posted originally on the bottom of page 10. This was a current listing as I am posting this:
BLACK SMART COVER COMPANION TPU CASE FOR APPLE IPAD 2 | eBay
I just got it today and really like it alot. I considered the targus, but didn't see great reviews. Almost bought the canvas, but they are out of stock and I wanted something sooner. I won the auction Tues aft and it arrived today...
My brief review: It is made to work with the smart cover - I have the black leather (didn't realize it was leather, just wanted black to go with my black ipad - wasn't till I got home that I noticed the receipt was higher than I expected - and since it's not that close, it's not quite worth returning at this point
It is fairly light - made of tpu as the post states - although a little heavier than I expected. It fits very well overall, except at the 30pin connector and side switch there is very little material between it and the edge so it flexes slightly. I don't see how any company could reinforce that well - maybe with a metal/plastic rod in it, but other than that very snug. It is not a preventative for water and such - the ports are all open, as well as the speaker area. However, the cutouts are placed extremely well. It has a lip all the way round which comes over to the front to hold it in place. It was easy to install - took a min or so to stretch around.
One thing I found that was great - with the leather cover there is a slight lip at the edge of the smart cover. Think where the material is sewn I would guess. That sits perfectly on the lip of the back and seals off the screen completely. I was getting the dreaded lines across the screen in the creases of the smart cover, which was annoying, and I am hoping this will cut that down. We will see...
Also, I have been using a lot as a book, both reading and for instruction, and pulling the smart cover off so as to only hold the ipad. This feels great and the cover still pops right off...
Overall, for $13, it's a hell of a deal imho. The guy I bought it from is not listed there right now - his listing was removed as the guy listed in this post accused him of stealing photos, but I am pretty sure they are all alike.