Where to Find Graham Cracker Crumbs

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For my son's class, they are making smores in a jar. So I was asked to come in and help. I have to bring in Graham Cracker Crumbs. They asked me to bring in enough for 32 cups. First of all, can find this stuff in the supermarket? Or do I have to go to a specialty store? Then the next question is.. how much do I buy to cover 32 cups? I saw on the internet it comes in 13.5 oz boxes or a bag of 5 lbs. If someone can help me I would appreciate it. THanks...