What cars did you pass on buying in the 60s/70s because they cost too much

When I was in high school the mid 80's, I noticed a clean dark green on green '69 GTX sitting out in front of a house for months. Knocked on the door to see if the car could be for sale. The lady said it had a blown engine and she would sell it for $500. I remember she said her kids called her GTX "The Tank". I didn't buy it because it didn't seem like that good of a deal at the time...