Special Request from a NJ teacher

Hello everyone, I joined Tennisopolis so I could post a special request. I'm a NJ teacher in search of (free) used tennis balls. (I'll use them on the feet of my classroom chairs to minimize noise.) I need a total of 88 (used or new) tennis balls! Can anyone help me out? If this online community is annoyed by my off-tennis-topic request I won't post again. Much appreciated.