Index Cards
Kids have no problems going through an entire pack of index cards when they are going through exam season. At the dollar store, you can buy a hundred of those for half a dollar. If you like buying things in bulk, you will also be able to buy 12 packs for only $6.
Index Cards
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Flashlight
The mini flashlight from the dollar store would not have the best quality, but you will be happy you have one when the power goes out. The keychain hook on it also makes it easy to carry around with you.
Flashlight