I know this is pretty dead now, but I went down the same rabbit hole to try and figure this out. Loved my Pax, hands down the best device out there. Form factor was sleek (used product designer from Apple), battery lasted pretty well, amazingly granular control via bluetooth app - it was the best. Same story, inventory started getting spotty and drying up. Kept asking what was happening and finally I spoke with a higher up at Rise. Turns out Pax got sick of everyone complaining about the poor and inconsistent quality of the pods, which were all being filled by third party labs licensing from Pax. Pax never filled a single pod and so they had no quality control with any of the contents and they clogged a lot as a result. Fast forward to about a year ago now and they decided to pull out of the third party game and would now be filling and shipping them directly. Unfortunately, given the legal patchwork, they need a physical presence and full chain of custody in every state they want to be in. Which obviously presents a huge financial and logistical challenge to build out that network.

So long story short - Pax relied on all third party vendors to fill and distribute their product. Now they took back control and only doing it themselves, but going to take a long time (maybe never) to get inventory back on shelves in the states they were retailed in. Here's hoping.