In the endless search for new gadgets I stumbled upon this today...hahaha...
Portable Ghost Radar
It doesn't matter if ghosts are real or not, where there is speculation, there are products and potential to make money. It works really quite simply considering how complex of an issue ghost detection is. If there is a ghost in the area, the button lights up, easy as pie. This device is available for $18, which is a small price to pay to know where Grandma Gretta is haunting nowadays