Just saw yesterday that the "For Sale" category is back, for now only when using the Oculus Desktop app. It can also be accessed here:
Maybe it will later also be available using the phone app - and the official website.
Also just got this email - it's been a long time since I received such "for sale" mails from Oculus - so maybe a positive change is on the way...
Valve Index & Oculus Rift CV1, Asus Strix OC RTX™ 3090, i9-10900K (5.3Ghz), 32GB 3200MHz, 8TB"Ask not what VR can do for you, but what you can do for VR"