I have a 20in. x 4ft shock mat that was purchased from Pure Terror Products last year. We used it through one season of our haunt, and it worked great. On one end of the mat, there are a few very tiny holes from where we mounted it to the wall, but these holes are only through the vinyl, not the wires that actually produce the shock. So these do not affect the functionality of the shock mat at all; it works like new.
I am looking to get $65 for it with free shipping (US only). If you are interested, please email me at firstname.lastname@example.org