Press and hold the Connect button located on the back of ... The process to reset the Sonos One is the same for the One SL, Five, Beam (Gen 1 and 2), Arc, Ray, Sub, Sub Mini, Port and Amp.
As of February 2025, you can still buy the One from Sonos, but very few are left. They are on sale, however, as Sonos is apparently looking to unload its inventory. If you already have a One or One SL ...