If you are looking to quickly stick a GPS tracker under a car you want one with a magnetic case.
Here is one with lots of great mapping features etc. which requires that you sign up for an account (the magnetic case is an upgrade). You can get the details on page if you click through:
GPS Tracking - MicroTracker
Small and easy to conceal, waterproof magnetic case - LIVE tracking with phone or PC - 2 week battery life
Price: $129.95 View Details
If you are looking for a cheap DIY model that lets you use your own SIM card then you might like:
Micro GPS Tracker with GSM
Tiny size GPS sends GSM text messages to your phone, easy to use… simply insert a working SIM
Price: $99.95 View Details
A new SIM card's cost will depend on what sort of coverage etc. you want. We don't sell or recommend SIM cards. You can get them from your phone company or buy a pay per minute card.
The DIY model is managed via text message from you cell phone. It reports back its geo coordinates which you can manually plug into google maps or use an APP with your phone to do that automatically. You would have to set all that up on your own. We don support any automated mapping Apps but we know there are plenty out there.
