Thanks.It looks like Sustainable Aquatics has Molly Miller in stock for captive bred. They do sell online if you go to the online store portion or if you LFS does business with them, they should be able to order them. They also have some other captive fish.
They are like the garbage trucks of fish. Will eat algae, debris, whatever food you offer and even documented eating Aiptasia.
Unfortunately, it seems like there are relatively fewer options in Europe for captive bred fish and this has gotten worse since Brexit seems to have impacted exports from the UK.