NEWARK, Del.--(BUSINESS WIRE)--With the new school year fast approaching, Upromise by Sallie Mae has raised the bar once again, offering members five percent cash back on all back-to-school purchases at hundreds of major retailers, including Bed Bath & Beyond, Staples.com, and Walmart.com. Also, this year, shopping through Upromise could mean even more money in your pocket: From Aug. 3 through Aug. 16, Upromise will award $1,000 to a member each day and one lucky member will receive a grand