Im currently trying to find some sports bras.
In the past I wore Enells, which are super supportive for larger cup sizes. But they cost 60-80$.
For my everday bras, I wear Decent Exposures, which are custom made in seattle. They are mail order, and Ive been wearing them for the past 9 years or so. They dont have underwire. My cup size is G or H, and with the shape of my body, its extraordinarily difficult to buy bras-almost never ever in person. No store stocks them. In my experience, even reputable fitters take your measurements and then try to jam you into something in the store.
Ive recently ordered some from amazon that qualify for free returns and the returns were no problem.