How much do hair extensions cost if you go to a professional?

Has anyone ever had hair extensions put in? If so, please tell me on average the cost!How much do hair extensions cost if you go to a professional?
It depends on how many bundles you are getting, how long the extensions are, and how much time (labor) it takes to put them in! I would call for prices.How much do hair extensions cost if you go to a professional?
A LOT, if it's reallll but still either way, fake or real!! =)