How much would a broken Iphone 4s cost?

The back and the front screen is cracked but it works fine.

I say $125 because thats alot of money to get it fixed

$75-$125 tops.
will be $199 to fix

Just replace it yourself. There are a ton of videos on YouTube showing you how. Just keep your screws organized and anyone can do this repair. I've done 20+ iPhone screens and never had a issue when using QUALITY parts. That is the key. Using cheap screens from eBay or Amazon will just cause more headaches. I use these guys and have never had an issue with quality -http://www.strivemobile.com/iphone-4s-screen-replacement-repair-parts.plus they offer full kits with everything you need for like 65 bucks with free shipping

The back covers are cheap, like 10 bucks on eBay, and the quality really doesn't fluctuate too much, so just go the cheap route on them.