I kick myself every time the subject of oscilloscopes comes up.
I worked at a technical college a few years ago. They had a pretty nice dual-trace scope from one of the electronics labs that the facilities manager couldn't figure out how to fix. He let me have it so I took it home and opened it up. It turned out to just be a disconnected plug. So I had a fully functioning, $400 o'scope to play with.
A few years later, I hadn't been using it much so my wife talked me into puting it out during a yard sale. She ended up selling it for $20 when I wasn't looking.

I really wish I still had that thing. Somebody got a really good deal.
Pat A.
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50% Nerd, 50% Geek, 100% Cool