Iphone 5 case swap/replace

Was just wondering if you can swap the actual iphone case for the black one can't seem to find anywhere that sells them

Hey the actual iPhone case can be replaced but not under the warranty of Apple. There are a number of businesses that can offer this service but it is pretty costly. You may be better going for a black case for your phone. Check out VIP Cases

Why not? There are many kinds of good iPhone 5 case in the market.