How much is it to fix or buy a guitar string

A single string is only $1. A whole set for acoustic our electric is $6- $18. Depends on the quality of the strings. Bass string sets are double the price. Restring is a do it yourself or the tech charges i think $28 to restring and tune it.

6 to 20 dollars

I believe they quoted $20 to install basic 6 string.

Guitar strings run about $12 -$14 a set. How easy it is to change the strings depends on what kind of guitar you have.

You have to get a set of string you cant just buy one not sure how much