2001 allroad, twin turbo 2.7 liter 30 valve V6, Quattro, Tiptronic, leather. 155k. Original price with options = $47k.
I paid $20.
It didn't run.
A $20 engine speed sensor, repairing a wire splice, and tightening a grounding post fixed it. I've put about 1500 miles on it. It runs great...