I'm late coming to the party on this thread but couldn't help chiming in.
I bought a '97 Riv SC in 1999 with really low miles, something like 7,000...
It was a GM employee trade in on a new
Cadillac.
For the life of me, I don't really remember exactly what I paid for it? Maybe $19,000?
I just remember that the original sticker was over $30,000.
I kept it until late 2003 when I traded it in with a little over 100,000 miles.
I remember that $7,000 was going to be my minimum trade in value and but ended up getting $9,000.
Car was White Diamond, loaded, no mechanical problems, and fairly new tires.
Other than "high" mileage it was still in excellent condition,
It is still one of my favorite vehicles to have owned and I would say the best in terms of build quality, materials, and overall quality control. And I still contend that the 3800 series engines are some of the best that GM ever came out with. I remember that the car consistently got over 27mpg highway and 30mpg was not uncommon.
Rarely see the last generation of the Riviera's today, but when I do, I always have to turn and look.