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Next week (11/17-11/23) Target will sell Pepsi 12 packs 3 for $ 10.50 (I put YMMV because I know sometimes the soda pricing is regional).
They will also have a deal where you get a $ 5 gift card if you buy $ 20 worth of Pepsi/Frito Lay products.
There is currently a Target Circle for 25% off Pepsi Zero.
If you buy six Pepsi Zero 12 packs, and you consider the gift card as liquid as cash, and you use the Target Circle, it should come out to $ 2 per 12 pack.