I picked Canon 17-40 f4 L lens today in $360 off craigslist! It is not stolen or something like that. The guy bought it 5 years back and thought according to what he had paid this was the right price!! US date code and really in mint condition.
Not Canon but, in 1986 I stopped at a yard sale and bought a circa 1941 Koda Ektra 35mm rangefinder with 35 mm, 50mm and 153mm lenses, Gossen light meter, owners manual and bag all in pristine condition. I bought the whole lot for $50.00! This camera had interchangeable backs, rare earth glass and sold for almost $700.00 in 1941. By comparison, a 1941 Ford busines coupe sold for $650.00!