Ugh--wish I could be more helpful, but I've been really cutting down on my trips to Jewel and Dominicks lately (in favor of produce markets and Trader Joes) so I don't have current info for you. I do remember that I initially thought they would be by the dried fruits/raisins, but they were usually in a display at the end of the cereal aisle or in an endcap. The bag is brightly colored with a cobolt blue color most prominent, especially at the top of the bag and the name (Cereal Toppers) is in big letters. I used to just scan around until they caught my eye! You can see a picture and read about them here:
www.cerealtoppers.com. They still list Dominicks as a distributer.
Good luck!