Site to value domain worth?

I have a number of domain's that are just sitting around doing nothing. The majority of them i'll probably get nothing for, but i'd still be interested to see if at least 1 or 2 have some value if sold. Is there a reputable site where i can get them valued?

www (dot) dnscoop (dot) com and more at goo(dot)gl #/# Zb6Co
But if you are just leaving the domain will nothing at all, I doubt whether it will value much.