I've picked up a few old bicycles in the last few months.
I bought this vintage "rikshaw" tricycle at an auction. All I did was clean it and repair one of the pedals. It's now being used at my wife's preschool. The kids constantly fight over it.
Also picked up this 1938-1940 Harvard DeLuxe ladies bike. It's currently being refurbished by a local bicycle guru.
Grabbed these two at an estate auction. Paid something like $25 for both.
Lastly, picked up this 1951 Humber from an estate sale about two months ago. It's an English bike. It was all complete and rideable. Had really cool brake set up, as well as a cool chainring with a "five men" design, and dual tube designed fork. It was a cool looking bike, but not my style. Paid $165. Sold for $400.