I picked up a few of these nameless #Arduino-ish boards from #Electrodragon. They have the ATMega4808 on them, similar to an Arduino "Every" which has the '4809.
At $4.50 ea it's a good deal.
Programming is a bit different with the #MegaCoreX library involved, and wiring up a Nano as a programmer.
Will tack on some threaded cmts about how it goes. A bit cryptic so far, but thankfully not much cash nor time invested yet.