New Raspberry Pi Zero
I already tested a (bare metal programmd) Pi Zero as a good companion for a P2
Now they released a new version: Pi Zero 2 - with 4x A53 on board. The rest (the form factor, connectors, etc) remained the same. $15 - or rather $21 here when including VAT - still one of the cheapest things with a CPU.
Ordered, to be tested as soon as I receive it.