How to find out what cards are worth?

Geoff

Aspiring Trainer
Member
Hi all, I'm not a collector or player but found some cards in a drawer from years ago. Pretty much all in perfect condition, some have never even been used. They all have the Wizards (c) 1999 in the bottom right, but when I search for similar cards some of them have wildly varying prices online and I can't work out why?

If anyone can help give me a rough idea of what they're worth or how to find out what I'm looking for it'd be much appreciate.
 
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