I ordered a couple "cheapies" on monoprice.com, but they are both great cases. I couldn't decide if I wanted a clear Polycarbonite or a white TPU, so I ordered them both (under $4 each, under $10 total with shipping). They both arrived on Saturday, not a moment too soon because I wanted a little protection and if nothing else a better grip for a weekend of boating and partying.
The clear case:
For only $2.70 each when QTY 50+ purchased - Air Case for Samsung Galaxy SIII -Clear | Samsung very thin, but barely sticks past the front so offers little front protection for setting face-down. Not quite thick enough to protect the camera lense when setting on its back. But it's a very thin, well-fitting case, and is perfectly clear so you can barely see it and shows off the phone's natural beauty. It also has cutouts for the buttons, so doesn't offer much protection or prevention of accidentally pushing a button, but just offering a better grip on the phone helps to hit the buttons.
The white TPU case:
For only $2.70 each when QTY 50+ purchased - TPU Case for Samsung Galaxy SIII -White | Samsung thin, flexible, and well-fitted. Offers a good grip and is just thick enough to protect the camera lens when setting on its back. Protrudes just enough from the front to protect the screen when setting face down, but is flexible enough that the "lip" moves out of the way temporarily when swiping all the way to the edge of the screen, but snaps back into place when you remove your finger. The buttons are covered, which I appreciate the added resistance on the buttons.
I decided to go with the TPU case for the weekend as I wanted the slightly better protection. I sure was glad I had it when I dropped it off a table onto a concrete patio on Saturday night (there may have been alcohol involved). I did not see exactly how the phone landed on the ground, but it was perfectly fine, the case wasn't even scuffed. And if it was, well they're $3 each...
I realize that's a pretty in-depth review for a couple cheapies that few will probably consider, but I wanted to make people aware of them because I think they are very comparable in quality to some of the other cases mentioned. No, they don't provide the protection of a rugged case or OB, but I already proved they can help a little. I still may end up getting a rugged case like an OB for high-risk occaisions, but will be sticking with the TPU for everyday use. And no, I don't work for monoprice.com, I'm just a big fan.