8 Must Have tools for Ghost Hunting

Dvice has an interesting article for aspiring ghost hunters. In it they list the top tools you should have on hand for ghost hunting.

Of course there are the obvious - a 35mm camera and an audio recorder.  But there's also some more advanced tools - such as the thermal imaging digital camera and the electromagnetic field recorder.

I guess my only question would be where to buy these things?  I'm sure there are eBay auctions but is there actually  a place aside from an army surplus store where you can find gear like this?