Bridesmaidzillas dress hell!!

Help!! I have been extremely laid back threw wedding planning. I’m allowing my bridesmaids to pick the dresses they want after every single one of them flipping out that they want to feel good in the dress they have to wear on my wedding day.
Due to not wanting any stress with the unnecessary drama.I said fine you all can pick a dress you please. But it must be same company color, fabric ect. We plan to go to David’s bridal next week for bridesmaids dress shopping. Since it’s the only local shop with bridesmaids dresses. I went online yesterday and realized they do not have my wedding colors I have been looking at from the site Birdy Grey, which they have very reasonable prices and a lot of colors to choose from. But non of my girlfriends wanted to go with that site due to not having a local shop to try dresses.
So I reached out through group text and expressed that I still want to go to David’s bridal to get an idea of the styles everyone wants but to go onto birdy grey for the similar styles then my color choice. This causes waves of drama. Birdy grey does free returns and exchanges so I don’t understand why it’s such an issue for everyone. I don’t know what to do anymore