There are several things you want to look for when shopping for a tattoo. 

A tattoo is going to be with you for the rest of your life.  A low price should not be the first thing you consider when shopping for a studio.

You want someone who is professionally trained, a few years of studio experience, artistically talented. They should have samples of their work in a portfolio and it should show consistently good results.

In a studio where the artists are not professionally trained the prices are not fixed and are usually based on undercutting their competition.  In a professional studio the prices are usually based on how much time the tattoo will take. 

Good looking tattoos are going to cost more than those done by people who are low on training and talent. 

It only makes sense to get your tattoo done by a professional, to get it done right the first time.  That way you are only paying to have it done once.

Cheep Work Ain't Good - Good Work Ain't Cheep