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Raspberry Pi Pico 2, our new $5 microcontroller board, on sale now
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
It was $5 but was limited to one per customer (in practice, one per order) at the usual vendors, and became very scarce at the time other pi models did. The wireless version was $10. They later eliminated the non-wireless version, bumped the wireless version to $15, and introduced a new fancier model (Pi Zero 2) that is also $15.