It has probably been 5 years since I've encountered the most basic Square reader in the wild (the $10 magstripe one), and I can think of a single time in the past two years I've encountered the cheap one you're referencing (which is why I forgot about it in the first place).
Yeah, those. I basically never see them anymore. There was a short time where they seemed pretty common, but I honestly only remember seeing one once in the last two years, at a farmers' market booth. All the vendors I frequent that used to use that have either upgraded to the full-function $300 Square terminal, or moved to using other solutions like Toast or Clover.
