Although many retailers have experienced less-than-stellar sales this year on slow consumer spending, the back-to-school shopping season holds the promise of lifting these doldrums, if only temporarily. With this promise, retailers must step up their game to get a piece of the predicted $26.5 billion to be spent during the second largest shopping time of the year. From where consumers are shopping, to top consumer frustrations, here are the facts retailers need to know about 2014's back-to-school shopping season.