what is the blue book price
Really depends on the condition and mileage but you are probably looking somewhere in the $1500-$2500 price range.
The Kelley Blue Book web site (http://www.kbb.com/) goes back only to 1987. The NadaGuides site (http://www.nadaguides.com/) says an '85 Supra L type with a gasoline engine is worth a little under $3,000, but your ZIP code and options will have some influence on that price.
Looking for a Used Supra in your area?
CarGurus has 53 nationwide Supra listings starting at $36,995.
Search Toyota Supra Questions
Toyota Supra Experts