I have a larger chest (D-DD) and really like Lane Bryant for bras. They start at size 36, I think. The ones I have bought have lasted forever and have much better support than the VS bras I have tried.
ETA: I just realized you asked about SPORTS bras, sorry. I normally just buy the running bras at Target and double up. I often buy a size or two smaller than my shirt size and that seems to help.