All year, I gladly accept what many would consider trash. :) ex toilet paper tubes, paper towel tubes, a few 2 L pop bottles, old toys (K'nex, blocks, Legos, gears, etc) Other popular items include: pipe insulation, styrofoam sheets, wooden blocks, matchbox cars, etc.
1st and 3rd 9 weeks:
Box tape (I try to supply each group with one roll, but...often they want/need more.)
Hot glue (large diameter)
Cool temp 'hot' glue sticks (small diameter)
Misc. add-ons depending upon which game your student decides to construct. I aim to provide as much as possible, but will likely need additional donations.
2nd and 4th 9 Weeks
I will have most of the basic components students will need to construct their projects. They are welcome to bring items from home. I do need almost all of the construction to occur in the classroom.