Yes, I found this one when before dd arrived. Sorry, it's a German website and annoyingly enough it doesn't give the brand.
I didn't buy it in the end - I just bought two normal sports bras. One is a Shock Absorber "run" and I just whip it off when I get home from running in order to feed dd. The other one is by Casall and is slightly less heavy duty, so if I unhook the back I can just hoick it up above my boobs and then feed - have done that in public (while, after a race and training) with no problems.