I was in Vegas in the late 80’s. 1.99 Breakfast and 3.99 Prime Rib. All Buffet.
Those days left long ago. I lived there and later Tonopah at the Station House Casino. I would say it all was gone by 2000.
Was in Vegas in February 1999 and Bally’s was the nicest. I can’t recall how much I paid for the dinner buffet the night I was there, but do remember that for their Sunday brunch it was between 75 or 100 USD and they had even a bigger spread complete with limitless champagne fountain. Breakfast ones were for about five to seven dollars and the other places were between 10 to 15 USD.