Would help if I could, but so far had the same experience as you DHM - most online seed retailers still open for business, but seem to be out of stock, at least for what I want.
One site (can't remember which), said 'more stock arriving 8th April', but what stock, and how long it lasts, is anyone's guess at the moment.
Apart from the inevitable staffing concerns at the retailers, I think the sector has seen its fair share of panic buying too.