I bought my Poke3 from boox.com when the choices for warehouses were EU, China, US. Since then, they've split off the US warehouse, but I believe we're dealing with the same entity. (I just noticed that boox.com added a UK warehouse.)
Then there is the Russian stuff with a zillion different models that you've never heard of.
If I were going to re-order, I'd buy from
https://us.boox.com/
I noticed that the US website doesn't offer the Remoter (clicker) or the foot pedal.