These are gone from ebay... and parks too.
There were a lot of things "not in stock" - like over at Doc Ondar's they had plenty of Jedi Holocrons, but no Sith ones.
We are currently planning on going back in October, so I'm hoping that they will have the Sith Holocron back in stock by then.
I could have sworn I saw the droid 5-pack when I was there, but since I already had it, it didn't really register. It might have been the color-change droids. I know over in Disney Springs at the Star Wars Outpost (the one over by the Once Upon a Toy store) they had the color change droid 4-packs along with the Droid Factory set. So, if the 5-packs are out-of-stock at the moment, it probably is only temporary and pending restock of the Galaxy's Edge stores.
Since those 5 figures are based on 5 actual "droids" that move and talk outside of the Droid Depot, I think that will be an item they keep in rotation for a while.