How much does it cost to have an IPhone 3 screen fixed?

So, my phone decided to be a jerk and then i threw it across the room and the screen got cracked (boy did I feel smart) my mom isn't going to pay for repairs (which is indeed fair because i was the one who broke the thing), so how much does it cost to fix the sreen? (the phone itself still works, yay)

I can't do it for £25. Are you in glasgow? Visit my site www.ifreefix.com