How much of Cash would an average Wayne gretzky rookie card be?

There was a time when a Gretzky rookie card would go for around $500 but I somehow doubt that's the case anymore. I tried finding the value online at various sites but they all require you to sign up for them which is bogus. I can tell you that an O-pee-chee version of the card will be worth much more than the Topps version. If I had to guess I would say you might still be able to auction one off for around $100, maybe $150 (but less of course for the Topps card).