Aside from the TV image and the Miller Beer card, I don't know of anything else with Farmer with the Brew Crew. Currently listed on eBay from seller hockeymonkey10 here:
https://www.ebay.com/itm/37356076929...0AAOSw-I9gitpJ
Now, if anyone has a color image of him in the teams new-for-1978 unis, it would be greatly appreciated.