Small MCU system-on-module options?

[thm_w]

http://www.waveshare.com/xcore407i.htm some onboard 1gb NAND, but no additional SRAM.
https://www.aliexpress.com/item/ARM-Corte-M4-Development-Kit-STM32F407IGT6-3-2-inch-Touch-Screen-Module-130W-Pixel-camera-module/32257851551.html 16M SRAM and 4gbit NAND, but the price is crazy ($80) and hard to source.

The problem is once you get into these high end micros, they are $15-20 which is already the cost of an orange pi. And the design of the board is really not that complicated, as you can see.
But I see the value of having a small 8-layer module with BGA CPU/RAM/NAND/etc all there and tested.