How to replace my iPhone 4s screen but not the iPhone?

The screen is cracked hella bad. I can still see the screen but its annoying. My iPhone works fine its just the screen. Is there a way to just fix the screen? Also how much is it?

Buy a new screen off of Ebay, and watch tutorial videos. Done it before, but it's a bit time-consuming and you risk messing up your phone if you don't know what you're doing. Best to get it replaced somewhere for $20 or something.

If you don't want to risk messing up your iphone go to an apple store and they will do it for a price