Best deal you’ve ever made on old cars

One of my best deals was in 1977 or 78. 69 GTX with a fresh jasper short block. About 2 miles and anti freeze was gushing out so he sold it to me for the price of the short block.
Took it to my buddies house and but 2 new head gaskets on it. Drove it for a year then sold it for 3 times what I paid for it. Bought it back for 1/2 what I sold it for and drove it for another year . Then sold it agin for twice what I had bought it back for.
It was a running Hosa with no rust and a 440 4sp dana.

My latest Best Deal is I traded a dana 60 trac lock and an 8 3/4 power loc and 2.76 gear set for a 2000 4x4 5.9 standard cab.
It's my beater with a heater daily driver now.