First choose a size not by the sites or Lucy's suggestions because they run so very small/narrow instead look at the base diameter if you can make a circle hole in something with the same width your whole breast needs to fit comfortably not tightly into it so you might end up needing xl domes even if you are small cup size because its the width that makes the difference not the cup depth.
You should be able to order by adding what you want to your basket then paying http://noogleberry.com/shop/breast-cups-42/
If you have a problem email Lucy but try to avoid this if possible when I tried to order xxl she refused as I was only a 36in chest even though I knew my breast width would make any other cup too small it was really inconvenient to have to try a cup there was no way I fit into I was right she doesn't know your body only you do surprise the xxl fit me even though I was pretty flat because my breast were wide and if in doubt go up a size if its to wide its not as much of a problem as too narrow.
You should be able to order by adding what you want to your basket then paying http://noogleberry.com/shop/breast-cups-42/
If you have a problem email Lucy but try to avoid this if possible when I tried to order xxl she refused as I was only a 36in chest even though I knew my breast width would make any other cup too small it was really inconvenient to have to try a cup there was no way I fit into I was right she doesn't know your body only you do surprise the xxl fit me even though I was pretty flat because my breast were wide and if in doubt go up a size if its to wide its not as much of a problem as too narrow.