NEW YORK — Feeling nostalgic for the days when going back to school meant picking out fresh notebooks, pencils and colored markers at a local drugstore or stationary shop? The annual retail ritual is both easier and more complicated for today’s students.

Chains like Walmart generate online lists of school supplies for customers who type in their zip codes, then choose a school and a grade level. One click and they are ready to check out. Some schools also offer busy parents a one-stop shop by partnering with vendors that sell premade kits with binders, index cards, pens and other needed items.

Yet for all the time-saving options, many families begin their back-to-school shopping months before Labor Day, searching around for the best deals and making purchases tied to summer sales. This y

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