This is the first article, in a series of five, that will outline the best ways to shop at five of the nation’s leading retailers to maximize your savings. Each store has their own coupon policy, rewards program and sales cycles, so it’s important to learn the ins and outs of your preferred retailer. Up first: CVS. Stay tuned for Kroger, Walgreens, Safeway and Target. Here’s what you need to know about CVS before shopping.