Title Nine. They sell non-sports bras, too. They have excellent customer support and a no questions ask return policy. Visa and Master Card only (in case you use AmEx).

Title Nine tests bras. Thousands of bras. They have many testers and they test each size and not just cup B. I have rwad that the industry standard is to only have live testers with cup B, and once their feedback goes into the final version of cup B, other sizes are adjusted by the computer without live testing. I read it a while ago and maybe things have improved, but at any rate, Title IX tests every size live.