The high bid for this car is $22,000 and it is still available. This has to be extremely rare given the low mileage, body style, color, and condition. Perhaps a bid of $26,000 might do it; add the 10 percent commission, sales tax, and transport so one is in over $30,000. If I really wanted it, I'd pay it, but keep it for a long time.
https://www.mecum.com/lots/1101384/1972-buick-lesabre/?aa_id=504229-0