How much does it cost to replace a cracked iphone 4 back?

I've cracked my iphone 4 back, how much will it cost to get it replaced by Apple?

If it's the screen your talking about a repair by almost anyone would cost around £40-50

The back is about $8 from eBay. It takes roughly 45 seconds to replace. Order the replacement kit that includes the pentalope screw driver to remove the bottom screws.

Its literally two screws, slide up, remove, replace, slide down, two screws back in. Done