What is a good slim cheap but protective iPhone 4 case?

I want a case that is protective like an otter box but I don't like how bulky it is. I know the bigger the more protective but are there any that are decent in protecting but not too bulky for pretty cheap? (Like under 30$)

Slickwraps carbon fiber wrap PLUS a transparent case
OR
barely there slim case for iphone 4
OR
my favorite but slightly bulky - speck candyshell

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