There are two types of breast implants approved by the Food and Drug Administration (FDA): silicone-filled and saline-filled. They come in various sizes and shapes, and with two types of shells: textured shells and smooth shells. A type of silicone-filled implant with a thicker filling, called a form-stable highly cohesive implant, or "gummy bear" breast implant, is currently under investigation and may one day provide another option for women undergoing breast augmentation with implants.
Another option is to consider getting your breast implants at a teaching hospital from a learning resident. You won’t get the delicate skill of an experienced, board-certified surgeon, but teaching hospital residents are “assisted by established, experienced, private attending surgeons,” says Beverly Hills plastic surgeon Dr. Robin T.W. Yuan in a RealSelf Q&A.