If you're in NYC ever, check out Town Shop, the Upper West Side institution:
http://townshop.com/
I grew up in this area, and remember being taken here by my mom at 15, horrified and embarrassed by my already-growing rack. I was forcing them into a crappy training bra, and the matriarch of the place, the now-deceased Selma Koch, said to me, "Oh, no, you can't wear that - you'll bust your tissue!" I wanted to die. But years later I went back and got the best fit of my life. I still schlep up there from Brooklyn a couple of times a year. They do mail order.
- Leela