This car just sold for only $3000 at the Mecum Indianapolis auction. They don't say the mileage, but it looks pretty good, and I was expecting the bidding to get in the high four figures if not $10K or more. But not even close. I should have bought it! https://www.mecum.com/lots/FS1020-440702/1978-mercury-grand-marquis/
This car I think was posted on here a few months back in northern IL for about that price. Thought at that point too what a great buy that would be. God $3 grand and an 8-10% sellers premium. He got nothing for that car. I’ve seen a good set of those deep dish wheels sell for $1,500.