Ever stumble on a good deal for a used part

I picked up a 4bbl weiand intake for $50 one place, A almost brand new Edlebrock carb for $100 (the guy put it on, didn't like it and took it off..), then decided I was going to go a different route and sold it for $175 + a radiator that I needed.

I've gotten a lot of others too, but that is a recent one.