I usually just use steam card exchange, they have a preview section.
Example: http://www.steamcardexchange.net/index.php?backgroundviewer-11162
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The pricing is listed on the game page.
Example: http://www.steamcardexchange.net/index.php?gamepage-appid-287700
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I found some on google, but all of them are quite glitchy...
Thanks!
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