If you search AliExpress for "mini phone" you'll find plenty. Looks like the price hasn't changed much:
https://www.aliexpress.com/item/New-Arrival-Ultra-Thin-AIEK-...
It's amusing to see some of them advertised as being "low radiation", presumably to appeal to the health quacks, but all that phrase connotes in my mind is "bad reception".
Edit: a look inside reveals not much has changed from the one in the article, only the casing: https://www.youtube.com/watch?v=5h8Ca-yzKuc