I buy them on AliExpress.
This is the listing, right?
They told me that if I am willing to commit to at least 300 of the 4GB/32GB eMMC + BT/Wifi then they could produce them for me on demand.
I told them that it was insane to expect anyone to commit to developing a product around a platform that they would have to buy USD$30k worth of to see if it could (for example) support a particular display panel configuration using eDP.
Having this kind of chicken-and-egg problem is a quick way to doom a SoC, which is super frustrating because I definitely want to use it.