got one for each diet sprite 2 liter I bought! woohoo!

excuse my ignorance...but what exactly is "catalina"?

Coupon that prints at the register from a separate printer from Catalina Marketing.

Triggered by your competitive product purchase or as a thank you for what you bought or meeting an offer requirement or sometimes random.

this is still going on btw. I used some of those $2/2 2 liters, got the sprite for free and the catlinas still pop out. Not sure how long this is going on for or at what stores besides Giant. But I am almost certain it is triggered when you buy Sprite or Sierra Mist. I have 5+ coupons now!