C.D.
I have the same problem and I tend to look on line then try to buy the suit on ebay or something- they are usually brand new with tags. I like Miraclesuit and some of the other brands that make a line of swim suits specifically for C cup and up people. I used to have luck at a good JcPenney or Macy's as well, but you have to really look. I have never had much luck locally, but if you look at the swimsuit tops if you go with something with thicker straps and a v neckline you should be ok. Good luck!