Wanna know where your cheating mate is? Mini GPS devices

Insignia sells the Little Buddy GPS system through Best Buy for 99 bucks. The Zoombak is another such device. It also sells for 99 dollars. That's a lot less expensive than a private investigator.

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These little bitty GPS trackers can be sewn into an article of clothing, slipped inside the lining of a reusable lunch bag, backpack, or hidden in a car.

They are not marketed for spying on your wandering mate but I suspect that's going to be a sizeable portion of the market. The official sales pitch is for keeping tabs on your child or pet.  But if your BF is coming home from a sweaty workout and you suspect it is not from going to the gym, you can stash one of these babies in his car and track his vehicle from your smart phone or computer. You don't have to constantly watch the onscreen blip. They can be programmed to text you if the device moves outside of a predetermined area.

You dog you! Your husband's face here

Is your wife really going to vist her aunt or is she banging away with Antonio at the no tell hotel on route 40? If your mate says they are stuck at work but you can see their location move from restaraunt row to the Claremont Inn you'll know otherwise.  You can even text them. "Your stuff is on the lawn with a "FREE" sign on it you lying %$%!"

Of course this will also be useful if you are a nut case stalker. Attach it to the object of your obsession's car and you'll know where they are at all times! Yay!

Good idea for kids? Bad for kids? Dunno. If they know they have it, they can ditch it. Critics view these things as extremely invasive. Suspicious mates will be able to find out where you really are for just a few bucks. Who knows, maybe your mate has planted one on you already.