Hi,
Five or six years ago I bought a Champion brand sports bra at a store that just sold dance gear and leotards, etc. It cost something like $20-30, but it is the only one I've ever come across that prevented bouncing. It's very sturdy cotton, but comfortable. I wouldn't recommend any of the cheaper-type sports bras that they sell at department stores for size D. It seems like they're made of the bounciest, stretchiest material possible --isn't that what we're trying to prevent? If Champion still makes a sports bra, I'd buy that.
-Joan