I got most of my mums from my mum
or from Bluestone Perennials. I do always buy some in the fall locally. Some of them have overwintered. They are the least likey to.
Many years I will cage my mums to keep them from flopping all over.
These are from 2010 before I moved to my most recent house. I try to cage them when they are little. Then you can't even see the cages!