Selling to Students ?

IS it OK for teachers to be selling class materials to students, materials such as color pencils, ball point pens....things not provided by the school, things not available for purchase at our "student store", but needed for classes ? Or, should teachers just spend their own money to supply their students with these materials ? Should students who need such materials and the materials are not supplied by parents or the school, "work" for the teacher to earn these school materials?

What do you do in this situation? Please share it with us.

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