@demonhunter,
I heard tell of a relative of mine (may be a myth) who came up with a surefire way to kill roaches and other pests. For just 2 dollars he would send you this wonderful device.
The device was a block of wood which you were to use to hit the pests, thereby ending their earthly existence.
I think you could probably up the cost to at least five dollars these days, plus of course shipping and handling. Maybe even have your company logo/name imprinted on the block of wood. Possibly run a sale where they could get 3 for the price of 2
And remember, when running this scam, all orders should go to a post office box, not your home address.