try
thebreastformstore.com (or .ca in canada)
I'm currently wearing a set of the Aphrodite Divine Collection. Just received my 2nd set actually. They are about $550 (for XS or S) and prices go up the bigger you get.
I really like them.. with some Hollisters Medical adhesive (available at TBFS) you can wear the smaller sizes without a bra but I typically wear a bra with mine even with the adhesive. They feel very realistic and bounce/move with you, not sure how they compare to real boobs, but it's a start.
I tried XS for my first set and they were probably the right size for me, but I needed to replace them just a week ago and went with a discounted pair and they only had S... which is still ok, but "my boobs" are definitely bigger visually to me.. not sure what my co-workers notice.. lol
My profile pic is actually the XS Aphrodite forms.
As nice as they are, I still want real boobs ASAP.. haha