* Rarity: Cards range from common to ultra-rare. A set of 700 commons would be much cheaper than a set of 700 holographic or promo cards.
* Condition: Cards in mint condition (never played, no damage) are much more valuable than cards with scratches, creases, or fading.
* Sets: Different sets of Pokemon cards have different values. A collection of cards from the original "Base Set" could be worth more than a collection from a more recent set.
* Individual Value: Some cards might be very valuable due to their rarity or unique features, while others might be worth very little.
To get an idea of the value, you'd need to do the following:
1. Identify the cards: List the names of each card, including their rarity (common, uncommon, rare, etc.) and set.
2. Check online marketplaces: Look up each card on eBay, TCGPlayer, or other online marketplaces to see what similar cards are selling for.
3. Consider condition: Factor in the condition of your cards when comparing prices.
It's also important to note that:
* Prices fluctuate: The value of Pokemon cards can go up or down depending on demand and other market factors.
* Professional appraisal: For a more accurate assessment, especially if you think you might have valuable cards, consider getting a professional appraisal from a reputable card shop or auction house.