I find the BEST bras for working out (I do boxing) are those that zip up the front. I used to have DD's and got a reduction (before the band) and I still have C's and they too.....ummm.....bounce. The zip in the front bras are AWESOME! I've gotten them from Target before, but I know any large store would have them too (Macy's, JCP, Sears, etc). They are more expensive at places like REI and Sportsmart though.
Hope this was helpful - sorry no links. I just know the "type" of bra that has worked for me in the past - forgot where I actually got them.
Best of luck to you!
:mad: