I picked up a wireless one off eBay for around $ 100-150 a few years ago to protect the stables, put it in myself, still going strong. Change the 9V batteries in the PIR detectors once a year. Takes a SIM card, I have a $ 20 / year vodafone SIM in it. If the alarm is triggered, it texts me. I then pull up the cameras on my phone to see if there is an intruder. I can ring it, and enter the code over the phone to arm and disarm it.
It's very loud :)
You can do all the zoning stuff etc too, and it came with 4 car-style remotes if you can't be bothered entering codes.
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