The Amoena website has some on special right at the moment.
The only problem is that not every style is the right fit, even in the same brand.
I spent over an hour with the lovely fitter in David Jones yesterday trying on many Amoena bras and would take a different size or cup size in practically every style. She did warn me that would be the case.
She has written down the ones that did fit the best for me to try when my soft form prostheses comes. They tended to pull sideways and hurt without one so I couldn't tell if they were comfortable.
Some had a band across the cup that rubbed on the portacath, others came too high under the arm and I had to go down a cup or band size. It was very confusing.
I can see I am going to have to try them on before buying every time.