GPS trackers with no monthly fee are popular among people who want to avoid subscription costs. However, most real-time GPS trackers require a SIM card and data service, which usually means there is some ongoing cost. Devices like LandAirSea and Vyncs may include limited service for a certain period. Bluetooth trackers like AirTag have no monthly fee but do not provide true real-time GPS tracking. Before buying a tracker, compare device price, included service period, and hidden fees.