I'm in the process of buying the components from AE, and found a few thing that may be convenient for other people.
Vanxy (Fantasy Electronics) has a page for 1206 capacitors in many capacitances:
Same for resistors:
You can save on shipping if you buy a lot of parts from the same supplier.
I also created a wishlist in case it comes handy for other people (PAL crystals only listed):
I'll be reporting my progress soon!
A few of the pieces have arrived!
Clockwise, from top left: PS/2 keyboard connectors, ESP-12F, PCBs, push buttons, micro-USB connectors and video controller chips.