ship it in a small styrofoam cooler, next day fed ex, with ice in a baggie, insulin in another ziplock baggie, and something in between them like newpaper, so the insulin is not going to freeze. Bring it to fed ex later in the day for next day delivery so its not sitting around as long. Obviously pad it well so it doesn't jostle around.
I just received one similar to this, Michigan to Atlanta and the ice was still solid.