Really any item that a student could use to build, create, design, etc.
The following are ideas:
Mixed Media & Crafting
Glue Gun glue
Duct Tape/Clear Tape/Crafting Tape
Paints & Paintbrushes
Scrapbooking materials (paper, stickers, borders, stamps, etc.)
Crafting Embellishments (googly eyes, glitter, feathers, gems, etc.)
Pipe Cleaners
Trophies
3d Pen Filament
3d Pens
Cricut cartridges
Selphy CP910 photo paper & ink cartridges
Robotics and Mechanics:
Old mechanical toys/electronics (like Tickle-Me-Elmo, Furby, etc) - functioning or not (there is 'stuff' here for kids to use to attempt to make them work or change their function)
Robotics Kits
LEGOS
Textile Manipulation:
Felting Foam
Felting Wool
Fabric
Yarn
Thread
Ribbon
Lace
Tulle
Discovery
Science Kits
Brain Games
Fun random information books
VR Headsets
VR devices (Old Smartphones)