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tracker, you put it on something, and that something sends you its location (any where in the world) via the internet.

So it connects to the internet via... cellular networks? Is that possible for $5 (and only $5) without a service fee and/or the costs of integrating with multiple carriers?

an annual cost of $5/tracker.

Probably depends on whether it is a $5 one off cost and/or a recurring cost to keep the service going.

For $5 one off cost per item and say $15 for the monthly service I'd stick them to pretty much everything.

NB Also depends on size and battery life of tracker and accuracy (e.g. finding a Kindle in a house requires a small tracker and reasonably good accuracy).

Finding things in your home is probably better done via BT / NFC / RFID though, GPS reception is not going to be good indoors, and typical accuracy isn't good enough to tell you to look behind the chair.

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