1997 DeVille 7,800 ORIG. MILES in SoCal

Only 7,800 original miles.

This loaded and pristine cream/cream Sedan de Ville is owned by my mother. The car has always been in AZ, garaged, non-smoker, and near as-new perfect in/out. I moved mom w/car to California (still registered in AZ), and will be ready to sell the car soon. Car has padded top, gold trim.

What is the best source to determine a fair value for this unique low-miles DeVille?
Where are other good places to offer it for sale?

Thanks,
Steve