I bought a TPU case from daydeal.com. I have one for my EVO as well. It is very form fitting, and it is TPU, so it can bend and fold and anything else, but it holds its shape. It makes my Tab less slippery. It was also very reasonably priced (I think it was about 15 bucks).
I actually have 2 cases now. One is a hard shell case and the other is the portfolio case I mentioned before. I pretty much only use the portfolio case when I take my tab out with me. The only thing I don't like about the portfolio case is that there's no opening for the camera
I'm using the Seidio ACTIVE Case that Seidio sent to me and I really like it!!
Awesome case. I LOVE the lid. It's a bit expensive, but considering the level of protection, and how much raw material you're getting versus phone cases that cost almost as much, I think the price is fair.
I bought a black leather case from Amazon when I ordered the wifi version callde the Toblino from mobilevision. Very nice has an easal feature as well. Much nicer than the one Best Buy offers and almost half the price. It was 19.99