What is the best cheapest bumper case for Iphone 5?

I've been using this one and it's worked great so far. It's transparent and black so you can hardly tell it's there and it's only $20.

https://www.cellairis.com/product/cellairis-polycarbonate-bumper-case-for-apple- iphone-5-clear-black

You don't say where you're are, but I got this from Amazon UK and I'd highly recommend it.

http://www.amazon.co.uk/Invero%C2%AE-Plastic-Rubber-Bumper-Buttons/dp/B009ARM0ES /ref=sr_1_1?ie=UTF8&qid=1363895899&sr=8-1http://

You can get it in any colour you like, it fits perfectly and it looks good.

Costs only £4.00