Certainly it is upsetting to have a saline breast implant deflate; that is just one of the reasons that most of my patients now (since November 2006) choose to have the latest-generation cohesive silicone gel implants used for their breast augmentation.
But you had your implants placed 8 years ago, when the FDA did not allow use of silicone gel implants for first-time elective breast enlargement patients. The manufacturer does provide free lifetime replacement for their implants (both manufacturers), and will reduce the price of silicone gel implants by the cost of one saline implant if you decide to switch both now that you have to undergo surgery for your deflation. If you purchased an extended warranty at the time of your surgery, the manufacturer covers additional $$ for the procedure costs. But now you need to have surgery--consider that a bit more spent now to replace both implants with silicone may prevent another operation, cost, and time off work in the future.
But really, your surgeon is not at fault for your 8 year later implant deflation; neither are you, unless you subjected your implant to unusual pressure or injury, and nobody would knowingly do that, would they? Every surgeon has their own re-do policy; this is something I explain to every patient who sees me for consultation, and each patient also receives a written copy of revisional surgery or re-do surgery cost responsibility. In my office, I would not charge a surgeon's fee for implant replacement (I donate my time for free for my own patients) even 8 years later, and my patient is responsible for operating room and anesthesia costs (and implant costs, if not covered by manufacturer or if the patient elects for a size change). Other surgeons may charge a surgeon's fee (perhaps reduced) after a prescribed period of time (usually a year) in addition to overhead costs (OR and anesthesia). The latter is fair; I choose to be better than fair.
We "know" it's not the doctor's fault since you had 8 years of non-deflation. And don't you feel just a tiny bit ashamed implying it might be? Do you take tires that have been on your car for 8 years back for a "free" tire (and removal and replacement labor) if you have a flat?
Really, I understand that some patients expect their surgeon to be "perfect," but asking for 8-year-in-the-future perfection is a bit unreasonable. Now, go make nice with your surgeon and get yourself taken care of! Good luck!!