I went school supply shopping for my daughter today. She's going into kindergarten. I bought everything on her list, and some multiple items for everyone to share. I don't know if they use a community box or not, but I don't have a problem with my kid sharing. After going through my receipt I figured out that just the stuff on my daughter's list was between $40-50. I spent $80 total. And I still have to get her a backpack. I really understand those that may not be able to purchase all of this stuff for their kids.
If the teacher needs more supplies throughout the year I have no problem getting more.