Marvel Comics Pricing Guides

Where can I find a guide price for card X-Men, which is free?
I have X-men cards and some comics that I've never heard, but I want to find out what I've accumulated over the years and just want to find a pricing guide for X-men cards and comic books which is free and easy use. As I'm a comic book from 1964 called Groo the Explorer, but can not find the price. however, I just want to find a site that has more than your average comic books like Marvel or DC, but others as well.
It seems that question time has expired. If you received a response that suits your needs, choose one of these as "best answer". If you have not received a good answer for your question, you may want to consider the following: 1) Re-submit your question. newer questions get more activity on Yahoo! Answers that old. 2) If you re-send your question, think why not answered first. Could you be more specific? Could be better formulated? There were grammatical errors or spelling? It was in the best category? If it does not seem likely re-post your question will help you, so here is a list of my favorite 'answer sites. Maybe one will help you. Answers.com http://www.answers.com/ Bartleby Reference http://www.bartleby.com/ Yahoo http://education.yahoo.com/reference/ HowStuffWorks http://www.howstuffworks.com/ http://en.wikipedia.org/wiki/Main_Page Wikipedia Since I really have not answered your question, no need to give me any points. Regards.
IGN Holiday Buyer’s Guide 2009: Comics and Toys