There are numerous factors which decide the value of a trading card. Which sports trading card you have? Is the player featured in your card a big hit? Is it rookie and common card? Is it a modern or a vintage card? If vintage what is the condition of the card? Once you are through answering, you may visit an auction site or refer to online price guides or print magazines and guides.
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The verb "is" implies singular but the noun "cards" denotes plural. Do you want to know what a specific, single card is worth, a grouping of cards or the value of all cards in a complete set?
The full set of ET trading cards lists for $25 in top condition. If your cards are damaged, they would be worth far less.