Just an update. I am not giving up!
I knew about pvas from back in the day when I was ferociously breeding cichlids. They have monthly meetings with sales & auctions. Next one is 1/4, and they are going to put a note in monthly meeting reminder that the Big 'E' needs lots of plants. We'll see. Fortunately, only 10 miles from my house.
There is also http://gwapa.org
, the Greater Washington Aquatic Plant Association. Name sounds promising, but they seem to be hibernating for the winter. Forum is all but dead, and no events planned yet for 2020.
So, a bit behind schedule, but undeterred. More later.