There are no places that offer such a service for free. They are all fee based. The best way to gauge a true value of any card is to do an eBay search and compare past sales to what you have. If you are going by the Beckett magazine guide you can cut any given value by 50%-70%. The beckett is not a very good tool to gauge a hockey cards value.
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Check out for online Hockey Card Price Guides. You can check out Beckett.com website. It offers not only hockey, but online price guide most of the collectibles. You will need to subscribe which will cost you a few dollars, but yes, you will get access to a huge database of pricing lists. This online price guide features highest and lowest book value and can be of good help to you.
Another option is to check out from eBay. Here you can see the real time pricing of your cards and how much collectors are currently paying for a card. But, you need to do a complete item search. There are different dealers selling at different price points.
Beckett.com is a good service, though there's a fee. The values are updated regularly, and there are good tools to help you organize your cards.