Back-to-school supplies cost more this year

(CNN) - Parents sending kids back to school have to dig deeper into their pockets for supplies this year.

The National Retail Federation says families in the United States are spending $11 billion more on school supplies this year than three years ago, which is about $168 more per family.

Many families are already adjusting their household budgets to absorb higher prices, but when everything costs more, it can add up.

Klover, a consumer data company, says the price of Scotch tape products has surged 70% from last year. Sharpies are up nearly 55% and Elmer’s glue is up 30%.

There is one notable exception. Crayola Crayons have seen a steady drop in prices in the past few years.

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