Well, it was not a Pentax deal but bunch of years ago (when digital cameras had only VGA resolution sensors) I picked up Olympus OM-PC camera at the garage sale. Owner told me that the camera is not working. At the $3 price tag I figured that it would be worth to get it just to play with it so I purchased it. Went home, put new battery in and the camera was working. Used it for about 1.5 years and sold it for $120 on fleabay
Pentax deal? Like new Sigma 70-300mm with caps and case for $61 shipped. Still use this lens and love it.