AutoSock is legal in all 48 states. They should also have some for super singles, but they won’t be cheap. I still have mine from last year, along with chains. I haven’t used either yet.
The best thing to do is to visit their official site and search for locations along your route. Then you call them to know if they have yours in stock. That’s what I did.
There should be a tire size chart for AutoSock somewhere, so you know which ones you need. Make sure you get the right ones. I remember the lady handed me the wrong ones, and when I told her, she made a fuss out of it. I eventually got her to give me the correct one per the size tag on the package. Who knows what her intentions were.