where to buy cases and screen protectors online?

There are cases available in the AC store. That's where I started. I ended up, after reading about it in another post in the forums, choosing the ZooGue case for the Xoom. I like being able to adjust the stand to more positions, and the strap works great for holding on to the Xoom, and it doubles as a strap to put around the headrest in the car. I put it on the passenger seat, and my son can watch movies in the back seat.

ZooGue Case Genius For The Motorola Xoom