Find out what a brand new one costs right now from Scamp, and discount it slightly, very slightly. Buyer avoids a two year wait, saves on sales taxes, and may save on shipping. South Florida buyer avoids trip to MN.
Chances are the current value will exceed what you paid originally. May not sound fair, its just how it is right now.
Also check
fiberglass RV 4 sale site as suggested above.
All this assumes perfect condition, clean, no odors, never smoked in.