Cheapest board with emmc

I’m very happy with Raspberry, but I would test a different board with emmc.
What is the cheapest solution for play with it?

Onboard eMMC or eMMC socket?

From what I see, among our supported SBCs, NanoPi NEO Air is the cheapest with fixed 8 GiB onboard eMMC:

There was the NEO2 Black edition with eMMC socket, but I cannot find it for sale anymore. Probably they stopped produced in favour of the new NEO3, although it does not have eMMC support.

If you want to new board with recent technology and much more power compared to above:
DietPi support comes with next version:

Thank you so much for the indications.
I’ll try