Best but cheapest place to buy lifeproof iphone case?

I'm getting an iphone 4s and i want that lifeproof indestuctable case and i don't wanna pay 80$ so in wanna know the cheapest place to buy one

That would probably amazon.com, but make sure you get an otter box their expensive (not that bad on amazon), but they are the best case you can get for your iphone

Amazon & ebay is your prior choice