https://klevercase.com/collections/size-1
They make some universal size cases (the type with elastic corners) which fit the new pw4.
I recently bought the following, from the uk ebay. It was suggested in the recent landscape stand-case thread in which I detailed hassles re buying one the 'right way up'.
https://www.ebay.com/itm/UNIVERSAL-A....c100005.m1851