What is the average cost of axillary breast tissue removal?

I am looking to get my axillary breast tissue removed. I started puberty pretty young and my breasts grew at a super fast rate so I gained some breast tissue in my armpits. I have grown to embrace my chest size but the breast tissue in my armpit is irritating to me. It’s a big problem area for me and lowers my self esteem so I plan to get surgery to remove it soon. I’m 18 years old so I can’t just drop everything and get a surgery so I would like some info on how much I should save up.