Cousineau is back up and running pretty well with blanks ans panels readily available on their website (for now) and WebbWood lowered their prices (at some amount) about two weeks ago.
It sounds like HUT has some WebbWood in stock for smaller quantity buys.
I think it is all being imported, no matter the company.
Cousineau has had a couple different sales since the beginning of the year on Spectraply, which is the low density stuff that turns more like natural birch.
As far as a dymondwood alternative for striker making, it looks like WebbWood is still not as hard as dymondwood, at least the stuff they are putting out right now. (They claim to have 5 hardnesses, though only 2 have hit the market it seems).