What’s the best deal you’ve gotten on cars or parts

In 1985 or so I limped a Monza spider into the lot it looks sharp bright red black spider on the hood flares I had put an oversized v6 in it but the clutch was completely gone I had to buy something at that lot it wasn't going to go any further! I looked across and saw a 1971 Gran coupe barracuda one owner 60,000 original miles slapstick automatic and AC, leather interior overhead console ashtrays had never been used I paid $2,000 and I think they gave me $800 for my Monza. Also the doors were literally falling off of the car the driver's door had fallen off totally before. I drove by the lot a few times in the weeks to follow and notice the car had never moved from where I had parked it.