I bought a craftsman mower at a garage sale back in the mid 90's, it was old and in pretty rough shape but ran good. Don't remember how much I paid for it but it was probably around $20. Maybe $25. I've slept since.
Only problems with it was the grass catcher was ripped up and the gas tank leaked a little. it leaked just enough to empty it between uses so I only put enough gas in it to do the job that day.
I replaced the grass catcher, one of these days I'll get around to fixing that gas tank