This week at CVS, there is an ExtraBucks promotion on various grocery items. When you view the qualifying products on myweeklyad under the “select beverage and snacks promo” (check in "grocery"), you'll see that the single bottles of Powerade are included in the sale. Take a look at how this particular item, paired with a rare printable coupon and Ibotta credit can make Powerade Zero only $0.25! Keep in mind that you do not have to buy four in order to get the sale price. To be sure it's included in your area, log in and view your personalized ad at myweeklyad at cvs.com.
Update: the ibotta offer is no longer available but the coupon still is!