We're in Shenzhen preparing for production and shopping for some parts.
Below is one candidate for the power supply brick.
I found limited data on this power supply and even then only for the four-pin variant. This one has the 5.5 x 2.1 mm DC power plug installed. It's certainly not the least expensive unit, but I expect it will pass the upcoming tests. I'll confirm the final power supply in another update.
Above is a pic of the production printed circuit board (PCB). More details to come in the next update!