No idea if anyone in the US sells them.

I guess Amazon.de would send them over.

https://www.amazon.de/-/en/Noaks-Waterproof-Protective-Cases-Sizes/dp/B00XYQCFG4/

I think I did buy the wrong set initially. Got the set of 1 of each size. And XL size is huge. L is A4ish so might make an inexpensive waterproof map cover.

The Smart Set (1 XS, 2 S and 2 M) would've been better.