CVS has Coke Family 12 packs on sale 4 for $12 (price may vary by region). These qualify for the $10 Gas Card Promo this week.

The limit is 6 or 8 per order, so you'll have to do multiple transactions on the same CVS card, but the offer "tracks" so no worries on earning the Gas Card.

Based on all Coke 12 pack, net cost is $2ea after the Gas Card is factored in (+ tax and any state deposit)

:note: Printable Coupons are generally available for 5 days or less.