> You'd have to dig deep in A_W's bookmarks to find an obscure shop with one in stock.

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=8931&start=111

One of them lists it as available currently.

> They seem to be available new in the same way Efika is available new.

It's different I think. Efika 5200B stock is constantly available simply because nobody wants it anymore, whereas Sam460 stock is quickly emptied everytime few boards become available.