GPS 7100--B vehicle tracker with easy install, no monthly fees:

For small trucking companies or anyone who wants to keep track of a vehicle (like, maybe, parents  of teenagers), the GPS 7100-B from Rocky Mountain Tracking sounds like a bargain. The $520 unit installs with  magnets, can supply the usual GPS data like location, speed and direction of travel, and can also be used to disable a  vehicle over the net. There are no monthly fees; customers pay only for accessing data. Of course, if you’re a fleet  owner or need to track your kids 24-7, those fees can add up, but if you just need occasional updates, this can be a  cost-effective solution.

[Via The Red Ferret Journal]