I know a lot of people swear by the Enell sports bra, but I bought one and hated it, had to send it back. It was like a snug vest; there wasn't anywhere to actually put my boobs if that makes sense.
I'm a 34G, so that's part of the problem. So I double up. I bought a Freya underwire, like this one:
http://tinyurl.com/263pmae
and then to further minimize the bounce, I pull a tight, stretchy Champion bra over the top of that. Locked and loaded, baby, those girls aren't going ANYWHERE. The Freya wasn't cheap, but I simply have to have something firm and supportive if I'm going to run and those silly little stretchy pull-on bras aren't supportive enough to wear around the house, let alone exercise in. Not for us girls with a lot on top, anyway!