With Inkling, you can use your iPad to buy your textbooks electronically one chapter at a time. You get one chapter of each textbook FREE and you don’t pay for chapters you don’t use. With each chapter you buy, you get extra features such as the ability to make your own notes and see notes from other users who have performed well on tests available through Inkling.
Use Thredup to swap the clothes your kids have outgrown for clothes that other people’s older kids have outgrown. Your cost is only $5.00 plus shipping. http://www.thredup.com/.