Greetings from the Florida Panhandle.
Welcome to the Forums. We're glad you have you with us.
NADA prices are absolutely useless when it comes to values of Airstreams. I would suggest tracking prices on Airforums Classifieds, RV Trader, and Ebay.
Values of a twenty year old Airstream are more dependent on condition than any other factor.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)