Hellobee Boards

I recommend the Fiona bra from Moving Comfort.
http://www.roadrunnersports.com/rrs/products/MCL217/womens-moving-comfort-fiona-bra/
My boobs were huge the first few months postpartum! My old sports bras had no chance of fitting. I like this one because they come in regular bra-like sizes (34B, 38C, etc vs S, M,L) and are adjustable so you can change it while your supply is regulating. My cup size was all over the place sometimes depending on the time of day. You can also nurse with it if you had to since you can unvelcro one of the straps.

I have an underarmour one from Sport Chek that does the trick.