Most of the times bundles highly reduce price of cards (especially if game wasn't in bundle before), so unless you want to check at last day, most of those sites won't be really helpful in long planning. But you can check cards price and badge prices on http://www.steamcardexchange.net/
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http://steam.tools/cards/ is pretty good but you have to remember that sites like this show the current sale prices. Which may or may not have anything to do with what the cards are actually selling at. Consider the prices show there to be the "BuyNow" prices rather than the "I have patience" prices. :)
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