Pass by wifi notifier

I need something small that can notify me via my cell phone when an object has passed by it, such as a gate or door opening.

Obviously cost would be important as there might be multiple uses.

Assistance in finding such an item at a very low price is greatly appreciated.
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EirmanChief Operations ManagerCommented:
Here are a couple of results for searches for gsm proximity detector and gsm proximity detection
which I believe you are looking for.

If you search for Intruder Alarm equipment with GSM notification
You will also find suitable equipment.

DIY Intruder Alarm equipment will always be much cheaper than Professional Equipment.

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