Teacher Esoterica: More Stuff to Buy in Bulk...or just buy.

1. Squirt Bottles.  The applications are endless: misting students with cool water on hot days, getting cool painting effects, demonstrating how rainbows appear, quickly creating a humid environment in the snail tank or greenhouse.  It's worth it to have a lot of these, each labeled with its intended use (or at least some of them labeled "water only").
2. White Address Labels.  A quick source for important information ("I have a permission slip!" stickers, for instance), name tags, file organization and similar.
3. Shaving Cream.  Practice writing while cleaning all the glue off the table!
4. Bubble Wrap.  Sensory pleasure for all ages!
5. Air popper and popcorn.  For about twenty dollars, you can provide cheap, healthy snacks that just about every kid will eat.  Freshly popped popcorn needs neither salt nor butter, and buying kernels is far cheaper than microwave packages.  One cup of kernels makes two big bowls of popcorn - enough to feed a whole class generously.  This can also provide an extremely cost-effective fundraiser.