Extra Boxes of Kleenex
Fine point Dry Erase Markers (Meijer brand is very cheap for a set)
Plastic page protecters (clear, smooth)
White copy paper
White lunch bags
Clorox Wipes
Pencils
Plastic cups (large)
"Real" paper towels
Ziplock bags (all sizes)
Hand held pencil sharpeners
Erasers
Electric Pencil sharpener 
Playground balls (soccer, football, etc.)