Wrote you back, VGLobby -- sadly I kept no records of the provenance of that specific ad, so I have little helpful context to add.

Hi Rowan, I'm on your blogspot page trying to figure out where you got the scan for "Chiller" back in October 2013. I'm a video game archivist trying to document the history of this game and there's a very rare version of this game only sold by Sharedata.