I had been looking for a new feature for my Halloween decorations and had come across these projectors from holidayprojector.com. Essentially, they are rear-projection systems you can place in a window and gives the illusion of ghosts walking around in your house. The kits cost $269, way more than I was willing to spend on a Halloween prop.
Coincidentally enough, I spied a similar projector in an ad for an estate sale in Des Peres, Missouri. That's a little bit further than I usually drive, but I was hoping for a bargain. As it turned out, they wanted $45 for it. I checked ebay and found with shipping, the same projector costs between $25 and $30. I told the person running the sale this and despite it being the first day of the sale, they dropped the price to $20 on the spot.