In my opinion, when buying older rigs in particular, it's not helpful to put much faith in the NADA (or similar) books because the value is most highly dependent on the condition of the motorhome and its appurtenances. Even something as mundane as tires, for example, can make a significant difference—if they're old enough to need replacement, that's an additional $1000 you will have to spend. Similar thoughts apply to the appliances, structure, etc.
At least around here, $15K or so for a 1999 Coashmen Santara in nice shape (well kept, systems working properly, moderate milage) would be an appropriate price. Other parts of the country may tend to have more or less expensive prices in general. I paid somewhat more for my '98 Coachmen Santara 315QB a year ago, and I believe I got a fair deal—not a screaming great one, but not a horrible one either, and I got a nice RV that is very suitable for my needs and wants. A fantastic deal on an RV that doesn't suit my needs would leave me worse off.
