Whistle 3 GPS Pet Tracker & Activity Monitor – Amazon – $39.95 + FS.

https://www.amazon.com/gp/product/B01N7MWKWY/
Clip the extra $10 off to make this $39.95, an all time low according to camel.
Subscription fee required with AT&T for the GPS/cellular tracking, for as low as $6.95/mo with a two year commitment (as high as $9.95/mo with a one year commitment; no month-to-month plans).