I just got an old Garmin Edge 520. It seems to work absolutely fine other than it does not connect to my iPhone 13 Pro. My iOS is 15.5 and Garmin firmare
TRAMsoft GmbH - GARMIN Edge 520 (english)
Garmin Edge 130 Plus
Cycling Computer: Garmin Edge 520 Reviews - DIY Active
Best GPS Head Units: 2022 Buyer's Guide | The Pro's Closet