Original DiC storyboards for the animated show becoming available on the collector market is pretty much unheard of and although there are studio copies out there, they are incredibly hard to find. Below are a couple of scans of some storyboard copies from a few episodes.

Mrs Rogers Neighborhood (Season 1 Episode #3)

Mrs Rogers Neighborhood PKE Meter scene






Photo credit: Ghostbusters Wiki

This single storyboard page accounts for roughly 10-12 seconds of screen time in the cartoon. The scene happens a few minutes into the episode when Egon gets a scarily high reading on his PKE meter from the house that Mrs Rogers lives in, one that actually causes the device to glow and explode.