What is a good deal hard laptop case?

I have a Dell 1705 (17 ") screen. I'm to face a difficult case that I can use inside my backpack to carry my laptop around in. I need something Not too large, but somewhat more robust than just a neoprene sleeve. I do not want to pay more than about $ 50. Suggestions?

http://www.qtcases.com/?gclid=COTJmcWH5I0CFQgSgQodEGRRyQ

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