Trying to find an UP-TO-DATE price guide on any TCG is difficult. It is even more difficult on games like this. Your best bet in an instance like this is to find a site that sells them individually. You won't get an exact amount of the value because the prices are marked up, but you will get an idea of the value of the cards in comparison to other cards. Also you can always turn to EBAY. One thing to keep in mind, look at the prices they are SELLING for, not what they are being listed for.
Another place you might check is the forums at this site:
It looks like people post on there regularly and they might be able to give you some direction as to where you might be able to find some card values.
Sorry I couldn't help more, hope you find what you are looking for.