I'm in the market for a 350 case, too. This probably isn't what you are looking for, but it does offer protection on all sides, so I figured I'd link it just in case:
http://www.sonystyle.com/webapp/wcs/...ionalImage1%22
It's probably a bit larger than what you are looking for, though. Happy hunting! I'm leaning towards the pink Sony case with the integrated light (at the request of my husband! At least now I will be able to stay up half the night reading
).