Less is more?

There's a fast food/ice cream/grocery store chain around here called Braum's, and in their little store they sell, right next to the national brands, their own brand of soda. A 12-ounce can costs $1.09. A 2-liter bottle costs 99 cents. Say what?

Let's do the math on this: 67.6 fl.oz. (2 liters) at 99 cents comes to 1.46 cents per ounce, while 12 ounces at $1.09 comes to 9.08 cents per ounce. Tell me, which is the better bargain? The only thing I can figure is that the can is some kind of collector's item, which I suppose it is, considering that anyone with half a brain would never actually buy it at that price.