NADA high retail is just under $6000, Kelly Blue Book retail is closer to $5000. It looks like someone paid $4,450.00 for it. I find it funny that the person lies about the NADA value then gives the link to the site. Oh wait, I looked in the wrong area, here is where the seller got the $9,200 figure. http://www.nadaguides.com/Values/ValueReport.asp?UserID=062CF728E02&DID=37550&Type=IM&GCode=CC&wPg=1107&wSec=2&Com=0050&Year=1982&Model=00018819

If I get my value from the same area, I guess my 1979 300CD is worth $8100.
http://www.nadaguides.com/Values/ValueReport.asp?UserID=062CF728E02&DID=37550&Type=IM&GCode=CC&wPg=1107&wSec=2&Com=0050&Year=1979&Model=00018866