Pepsi 12-packs are on sale at Walgreens this week, three for $9.00. Buy two packs of Diet Pepsi and one pack of Pepsi Zero. Use two printable Pepsi coupons at checkout. Afterwards, submit for rebates through Checkout 51. The final price will be just $1.33 per 12-pack!
Note: Keep in mind that soda prices vary by region.