You will have to pay for a subscription to Beckett online pricing. It's not really worth it if you are not already and continuously collecting and buying/selling.
The best way you can get pricing is the annual Beckett yearly publication for pricing. It does not carry the market value but gives you general idea of pricing. Another way is to just key the card into ebay and it can tell you whether it is selling or sold and how much.
Hope that helps you. Always remember a cards true value is what someone is willing to pay for it.
