I understand that plastic surgery can be costly, but unfortunately I do not think that you should be looking for surgeons by their price, but instead by their experience and expertise with the procedure you want to get. There are different third-party financing options offered for patients that you may want to look into. I would hate to see you compromise your results by going to a doctor mainly by the price they charge for a procedure.
If you account for operating room, and anesthesia fees for about 3 hours of surgery, that cost only will be around $2,000.00 (depending on the facility). That does not include your surgeon’s fee for operating on you. You should also make sure you are being operated on inside of an accredited facility. So to answer your question, I do not think getting a Brazilian Butt Lift for under $4000 is a good idea, for the sake of your results.
I wish you the best of luck, and do make sure to do some research on your surgeon before booking your consultation. I have before and after photos and detailed information about the procedure on my website if you are interested in more information.