When I was in my prime trash-pickin' years, say mid/late 80s, I never saw a roundie in the trash. Mostly RCA CTC-38s. Except ONCE...
I made my parents stop the car. Luckilly they had just bought one of those new-fangled "minivans" that are great for TV haulin'.
It was a 64-ish low-level Zenith. As I recall, it worked fine, lol!
Every roundie I've had since then has been a trade/etc. Never new anybody who had one either... My whole cheapass family waited until about 1968, but it was always Zenith, so I guess they just waited to buy the good stuff.
Never seen a roundie in the trash since, or even an estate sale.
