I believe their other site https://dubiaroaches.com/ is still good to go during winter until dec 17th at least. You could check ebay or amazon and see if anyone on there is selling dubias or try to breed them for now since it'll save money in the long run.
My goal is to start a colony in the summer time. I live in northern Vermont so it just doesn’t seem like a fun thing to try and start in the winter lol. Thanks!