Starkist is currently offering a $0.50/1 coupon on their tuna pouches on Facebook (with plans to offer something new every Friday). If your store doubles this could possibly net you a FREE pouch of the chunk light tuna.
There is also a sweepstakes on the same page to enter. The prizes are $500 and 1 FREE Tuna Pouch (sent via coupon). It just takes a quick sec to enter.