Traditionally getting paid to shop is a job for the professional personal shopper, but a new startup called ibotta is using that model to reinvent mobile couponing. The company has partnered with retailers like Walmart and Target to provide cash rewards to users who upload receipts proving purchase of certain items. You can also earn cash rewards by engaging with products by watching commercials, getting branded recipes, or taking branded surveys and quizzes. The app has been steadily climbing the iTunes charts with over 100,000 registered users in its first 75 days, and a notably young core demographic for couponing— primarily 15 to 34 years olds.