Here's a web site that lists places you can obtain one:Originally Posted by bttmline
http://www.polygraphplace.com/docs/instruments.htm
They can be expensive and you should be aware that it takes extensive training to use one properly; I'd investigate that aspect thoroughly before spending the money. To buy a reconditioned one, it can be $2000-$3000--check out this site:
http://www.polygraphsales.com/sales.htm
You might be better off hiring someone to conduct the test on a surprise basis, so that folks would be less inclined to cheat. Might cost $100-150 a pop??