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Officemax in Stony Brook had some school supply lists up by the front entrance -- I wasn't looking at which schools were in the rack, so all I can do is suggest calling them to see if the Oxhead and Dawnwood are in the rack.
Have you tried phoning the schools directly? They might be able to furnish you with a generic, grade level list so you might get the basics.
I have stocked up in the past whenever school supplies are on sale/clearance and keep a Rubbermaid bin full. It makes life a little easier during back-to-school crunch time.