Thank you for your question. To have fat transfer to the breasts, you need to have enough fat to be transferred to give you a good result. With fat transfer to the breasts, one can expect about a one cup size increase. If the BRAVA external expander is used (which adds to the cost), might be able to attain a larger volume. The advantage of fat transfer is that the breasts look and feel natural, you get a body sculpting procedure (liposuction to collect the fat) and there's no maintenance. The advantage of breast implants are that you can get more than one cup size enhancement, don't need to have an associated surgery, but the implants might need to be changed out in about 10 years. There are also other risks, albeit these are very small, of capsular contracture, malposition, rippling, muscle animation if submuscular, etc. The cost for fat grafting is somewhat more expensive initially (you get two operations), but in the long run it is cheaper since there's no maintenance associated with it. See a board certified plastic surgeon for an in person consultation/evaluation to see what would be the best choice for you. Good luck.