We used Invisible Fence and I think it was about $1300 for an acre, plus battery replacement. They are relatively easy to install yourself, but I am not sure if the equipment is as reliable.
I chose the professional as I wanted to ensure that it worked and kept my dog contained. I did not want to run the risk of the dog getting out and lost or hit by a car. It is expensive, but cheaper than a real fence. Personally, I think that nothing beats a real fence, but it was cost prohibitive for us for a 6' fence on an acre.
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