I bought this: http://www.amazon.com/gp/product/B004NY9UW8/ref=oh_details_o04_s00_i00 Built very well, and I just set my computer on top of it while using it, then put it back in when I'm done. It's padded relatively thick, enough to protect it inside my backpack.
i should have specified i didnt mean like an actual case case, i meant something that would protect go over it so it wont get any scratches or anything like that.
i was in the same position few days ago and found a couple of interesting ones. Amazon, for all its glory doesn't really have a good selection. I found some from E-bay that were very interesting. But you can try the book case from twelvesouth.com or a similar case from Moshi. Since I am going to be carrying it in a padded bag anyways, i settled for a neoprene sleeve... http://www.ebay.com/itm/Zip-Leather...4?pt=US_Laptop_Cases_Bags&hash=item19d7b86e00 http://www.ebay.com/itm/Brown-Portf...9?pt=US_Laptop_Cases_Bags&hash=item19d7c51a8d http://www.ebay.com/itm/New-MacBook...cessories_LaptopCasesBags&hash=item3f20332312 The above is really nice. http://www.ebay.com/itm/MacBook-15-...7?pt=US_Laptop_Cases_Bags&hash=item20cc0b7139 I love the sleeve above but not sure about the metal pins....