I just spoke with Exotic Angel...
So, I finally got tired of seeing some yummy hoyas on the EA website while NEVER seeing them in stores, and I gave them a call to find out how to get my sweaty little hands on some of their delicious little plants.
What they told me is that when a Home Depot or Lowes or somesuch chain orders with them, it's typically for an "assortment" of pots or baskets - which means the store doesn't know which specific plants they are going to get, and neither does EA themselves. The greenhouse filling the order just gives them an assortment of whichever plants are ready for shipping at that time.
Moreover, even if they could tell me when a BBS is getting a shipment, EA not only does not know which particular store is getting the plants, they do not even know which region of the country is getting them. (This is expected - the BBS decides itself how to distribute.)
More depressing news are for some of the species:
Multiflora (https://www.exoticangel.com/plant-library/species/hoya/item/346-) - not grown anymore, they told me.
Nummularioides (https://www.exoticangel.com/plant-library/species/hoya/item/352-) - she has not seen it on the availability list recently.
Longifolia (https://www.exoticangel.com/plant-library/species/hoya/item/344-) - availability seen occasionally, not recently, maybe not grown anymore.
Australis ssp. Tenuipes (https://www.exoticangel.com/plant-library/species/hoya/item/331-) - not grown right now.
Lacunosa 'Ruby Sue' (https://www.exoticangel.com/plant-library/species/hoya/item/354-) she has seen on the availability list before, but not now. (By the way, I have seen it in the store last year, but was stupid not to grab it).
These were the only 5 hoyas I asked about because they are at the top of my list of what's on their list.
It seemingly wasn't all bad news though. They put me in touch with a local EA distributor. But that hope was quickly crushed when they told me they do wholesale only.
So, I am back to seeing what I can find opportunistically - and relying on trades and purchases from specialized vendors, of course.