The two GWs around here rarely have anything sewing related. The last one we did find was a Singer 66 in a cabinet.
My wife found it and we went back the next day. It was against a wall with all manners of things surrounding it. A lady was sitting in a chair near it and when I opened the top she said: "There's a sewing machine in there"?! She was totally shocked and surprised. From a distance the cabinet just looked like an end table. Nobody was paying attention. I recognized it instantly, but then I knew what to look for. We got it for around $20 dollars. Great machine, in great cosmetic and mechanical condition. It's a keeper.
But it's one of the very few we've seen here.
Joe