In Ralphs kosher section they have this kosher soda I've never seen before, Stone Creek. It looks like it's from Northbrook, IL.
The cola and black cherry flavors are my favorites, and the diet is the best I've ever tasted. Bad news, it's like $1.50 a bottle, 1 pint.
I guess all the extra kosher stuff is for passover, so Stone Creek won't be there for ever.