If what's broken is in the charger, plug the USB cable into the tablet, then plug the other end into a USB port on your computer or laptop. (The computer has to be turned on to charge the tablet.) Or you can buy a USB charger for about $5 - look on Amazon. (Any USB charger will charge any tablet - if the charger doesn't have enough current, it'll just take longer to reach full charge.)
If it's the charger hole in the tablet that's broken, the ONLY way to charge it is to have the tablet repaired. There's nothing you can buy to fix that. (Unless the battery is removable, and you can find a charger that can charge that particular battery outside the tablet.)