There are almost never Coke coupons available.
You can get a Coke coupon for $1 off 2 20pks or 24pks.
Just scroll down a little bit to see the link and click that to get the coupon.
Safeway offers the 20pks of Coke for $5.00 all the time.
You can see more coupons you might need in the coupon database.
(Thanks Cookoo for Coupon Deals)