Value of a 1977 Cutlass ?

1977 Cutlass. It is very nearly in miint condition, having been garaged for many years. It has only 12k miles on in. The 'VIN' on the car is 3g37c7d254021, so, Oldsmobile Cutlass 'S' hardtop coupe w/ 231 cubic inch V6, built in '77 in Dorraville, GA. It has a few small, very shallow dent on the front fender.
Other than the small dent, this car looks and feels like it just rolled out of the factory, with less mileage than you would typically put on a car in a year. How can I go about finding the value of this car? The owner is an elderly person that ran into some medical problems and needs to sell it.
Thanks!
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Welcome to AF, looks good. Try nadaguides.com