Just head straight to the Guitar Counter and they can set you up with a single string. Most single strings are about 87 cents. You just have to know the gauge of the string you are replacing.
You have to buy a set, they wont sell one string
You might as well replace them all cause a cheap pack of strings can be like 5 bucks, but they charge 20 if you want them to do it
Not sure if the price for one but you can buy a set replacement strings and do it yourself for usually under 20
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