Any help will be appreciated.
Starline is the only one I know of that still makes it. BA and Graf occasionally have it, but they are both showing out of stock at the moment.
https://www.grafs.com/retail/catalog/product/productId/17833https://www.buffaloarms.com/41-colt-starline-cases-1-120-str41colt.html
Unfortunately they have none and no idea if or when they will produce more.