The list is in the info section.
Scanners are as easy to operate as your car radio. They're useful for listening to all kinds of things, including police and fire, fast food joint radios, your neighbor's cordless phones (good fun when you live next to a frat house in college), baby monitors, etc. The thing I use mine for most is listening to amateur radio operators who act as storm spotters in severe weather.
You can get them at any store, though strangely enough they're the one thing that Radio Shack actually does well.
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Jeff
Webmaster/Guide to The Point
Millennium Force laps: 35