Good paper towels
Tissues, tissues, and more tissues!
Building Materials -- Legos, Magnatiles, K'Nex (They don't need to be new!)
Indoor Recess Games like...
Bananagrams (my new favorite game!)
Skiwampus (a really fun, fast paced Math game)
TENZI (another cool math game that can be played all different ways)
Word a Round (a vocabulary building game by Think Fun)
For Engaging Lessons and Activities:
Teacherspayteachers.com Gift Card
Really Good Stuff Gift Card