How Much Does It Cost for Fat Injections in the Buttocks?

Thank you for your question. The cost average varies depending the doctor and location. I would suggest to be treated by board certified plastic surgeon with experience in this procedure, to get the best desired results.
Respectfully,-Dr. Emmanuel Mallol Cotes.-

The only safe thing to inject into your buttocks is your own fat and this procedures is called a Brazilian Butt Lift, BBL. The costs of BBL varies based on location of the practice, the
physician, the patient's anatomy, and the number of areas that are
needed for liposuction in order to harvest the fat to be injected into
the buttocks. 
I wouldn't choose a surgeon on cost alone, but look
at their results and choose one you feel comfortable with.
Additionally, most plastic surgery practices offer payment plans through
financing companies such as Care Credit and Alpheon. I recommend
consulting several surgeons to help find the one that is right for you.
Good luck!

Kamran Azad MD, Board Certified Plastic Surgeon

The cost of fat transfer to butt could be as low as $4000 however normally is around $4500 depending on how much fat is removed.  The more there is the more expensive it would be.

Fat injections are a time consuming process if performed correctly and in the volumes required for successful buttock augmentation. Therefore, seeking a surgeon on the basis of cost is not advisable.

Hello dear!
Thanks for the question.
The average cost varies a lot depending on the clinic, the country and the plastic surgeon. l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)