the cheapest place to find the stuff is on ebay.
here are some sirens/pa:
http://search.ebay.com/federal-siren_W0QQfkrZ1QQfromZR8
here's a controller that you'll need:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7702726649&category=396&rd=1
A guy i know has a crappy one in his K5. he has a noise problem so when he uses it his headlights flash like strobes. he is always harrassing people in parking lots...ouhhh that looks kool, my friend has this lil one he bought for 45 dollars off ebay.. it makes animal noises but its not even loud...i want one that cops have
Yeah, except the whole it's-illegal-thing //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gifSounds like a lot of fun harrassing people lol.