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They don't usually add dealer prep to a used car... that is unless you just have money you want to throw at them to do it.
1961 Merc? Sound like you might still be able to buy that one for $331 today. Have you checked Craigslist?
I worked for a new Toyota dealer in 1969. Then a new Corolla was only available as a two door sedan, no A/C, no electric windows, no carpet - only rubber mats, not even a radio, NOT even a radio. It sold for $ 1395. (Before destination charge and dealer prep )