I found this picture a while ago on Reddit. So far, this is, as far as I know, the only photograph of the Amherst Showbiz that has surfaced. This is exciting for me because the Amherst Showbiz is mostly a data pit (other than articles and ads in The Buffalo News and the floor plans on Internet Archive).
Link to original post:
Showbiz pizza (circa 1984/5) 1551 Niagara Falls Blvd Amherst NY: r/Animatronics
If someone could add this to the store’s Cheese-E-Pedia page, that would be amazing!