Graphing calculator: $100. Laptop: $800. Here's how to cut every big back-to-school expense.

If you only need a calculator for a single class, it could make more sense to rent instead of buying. If you only need a calculator for a single class, it could make more sense to rent instead of buying. You can try a kid-focused thrift store, like Once Upon a Child, or make the rounds of all the shops in your area. If you don’t have a dollar store nearby, scout out thrift stores for school supplies that are still in good shape. If you don’t have a dollar store nearby, scout out thrift stores for school supplies that are still in good shape.