I'm not quite sure what you're asking, because "reasonable" doesn't seem to enter into school funding decisions these days. Public school, my opinion? Writing implements, writing paper, a book carrier. Pocket calculator once they get to a level that they need one.

That's what's reasonable IMO. But I don't think it's reasonable for school funding authorities to expect ANY school supplies to come out of your (or any teacher's) salary. You don't get to make those decisions, obviously (other than how much you're going to spend personally, which is a decision you shouldn't have to make). So I'm not sure why you ask.