Just remember, you get what you pay for. It can be done on the cheap, but then you'll be getting hard, lumpy, scarred breasts that will make you wish you never had 'em touched.
You want to go to the best doctor, and that will cost you a premium. I dunno what the current cost is, but I know someone who went to one of the best in Toronto (sorry, I don't remember the name) and it cost something like $7-8K. But the job was amazing; probably the best fake tits I've ever seen (not that I've seen a lot or anything
).