How expensive is an iphone screen repair?

I have the IPhone 6 and I'm just stressing because I have a trip in three days and my phone had to crack on New Year's Eve. I don't have much money to just spend on other stuff, and so I'm just wondering if anyone has done so how much is a screen repair? I was thinking about a new phone but I don't know since I'm spending more money in the long run. Also long time ago I got my IPad screen repaired and it resulted in my iPad to start acting up such as sometimes it would press things I didn't touch or wouldn't react to my touch (but I'm thinking maybe it was just a bad job?) anyway thanks.

100-150 dollars.

The Apple Store charges $129 plus tax in the US granted it's just the screen that is cracked.