I was going to say the same thing as Knott. But, since I am at the opposite end of the spectrum (32A), I can't speak to your specific size issue. But... it is worth every penny to buy those expensive bras and get a fitting. I buy my bras at a real lingerie store where they carry tons of brands, they have my size (half the bras start at 34B) in many brands, and the salespeople know me and can recommend styles. I tried buying the expensive ones on line, but that didn't work.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport