[Ti] my powerbook value?

[jf]

Is there any way to find out the value of a powerbook g4 1ghz in June 2006?

June is when a computer tech took my powerbook for repairs and now 
after a long saga I am in small claims court with him.  He says my 
computer is worth $200 because it has devalued, it was bought in 
2003.  I think he owes me it's worth in June 2006 not March 2007, 
since he has had it since then without returning it.

Thanks,

Julie