Ive won at ebay a number of times, usually due to the seller advwrtising the camera and not the expensive.lens.attached to it... my best scores have been:

Nikon fg for $35 -- happened to come with a 50mm 1.2
Nikon f4 for $300 -- came with a mint 80-200mm 2.8 afs
Speed graphic fir $180 -- came with an aero ektar