I have seen a few parts, such as fancy ambidextrous charging handles, in stock at some of the places. But I stocked up pretty well before the ban hammer fell, so I haven’t been looking very closely.
I would stock up on receivers (upper as well as lower), and all components such as LPKs, pistol grips, barrels, BCGs, spare bolts; BCG spare parts - e.g. extractors, extractor springs, ejectors/ejector springs, gas keys/screws; charging handles, lower receiver extensions/buffers/springs; stocks, rails, forward grips, BUIS, and muzzle devices; and whatever else I might have left off of this list; EVERYTHING.
It sucks- prepare accordingly.
This is maybe overkill, but lots of suppliers who sell online are now too paranoid to sell/ship to WA.
ETA: And don’t forget retaining pins for firing pins, extractors, and ejectors. What I did was use the component lists on the White Oak Armory website to make up checklists for all of the AR parts/components- and then order accordingly.