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

  A new laptop or tablet can take up a sizable share of your back-to-school budget. Achieve shares some of the best ways to stretch your money. Big-ticket tech has the most savings options. Swap or buy used. Plan to save on small costs year-round by buying in bulk and using a rebate app. 1.