Seattle's Best Iced Coffees...these are pretty yummy. My favorite is the Iced Mocha...love it! Right now there are reports that many of the Walgreens have the Seattle's Best 4-packs on clearance for only $1.25!
Seattle's Best Iced Coffee 4 pack - clearance $1.25 (where available)
Final price: FREE
Note: If you cannot find the clearance, look for a deal where you can still optimize your savings!