How to do it: A new study from the Online Publishers Association reports that tablet users spend $349 a year on purchases made from their devices. This means your small digital treats are costing $29 a month. How about making a deal with yourself to cut back, say, by just 10 percent? Go ahead and spend $26 on whichever magazines or videos you like, but when you're reaching for the download button for the purchase that'll send you over the limit, just say no. By the end of the year, you'll have $36 that you might otherwise have spent on watching The Notebook...again.