I splurged and bought a Wacoal because they're like the only ones who make sports bras in my size (I'm huge now that I'm preggers). Trust me, you won't be going anywhere with these, but they are expensive at $50 a pop.
I suggest checking out titlenine.com. They have a great selection of sports bras depending on the type you need.
Before baby I was a 34D and used the Last Resort Bra:
Post-partum and BF I am a size 34E so I am using the Marvel:
These are pricey but totally worth it if you are doing high impact and have big boobs like me.
1 LC, girl 5 years old
TTC #2 Summer 2017
BFP 1/5/2018, MC (D & E) 2/23/2018
TTCAL May 2018
BFP 9/20/2018, MC (D & E) 11/16/2018
I second the Title Nine suggestion. I got the 4-reasons (or maybe it was 5-reasons) bra there after DS#1. The straps fasten with velcro, so it also worked great for nursing. Oh, I was a 34DDD before him and now I'm a 36G.
Current Age 35, DH 33
BFP 8/2012, Miscarried 9/2012
BFP 9/2012, DS 6/2013
BFP 6/2014, Miscarried 7/2014
BFP 7/2014, DD 4/2015