When you play online bingo the cards take care of themselves. You never run out of available cards when the game is electronic, but when you host your own bingo games this unfortunately does happen from time to time. Fortunately you can always buy spares, and they come in big stacks of no less than 250 cards per package with never a single duplicate card in any one pack. So spare your club or your home-hosted bingo event the embarrassment of running out of cards just when the game is getting going. If you're not playing online, remember to restock your cards on time!