I'm so glad you asked! I've spent a lot of time reading labels and I'm very particular about my favorites.
Yogurt: Total greek-style, by far and away (but see my post in the yogurt thread about the temporary unavailability of this brand), sold at Trader Joe's and Whole Foods.
Cereal: I love Hi-Lo (named for high protein, low carb), sold at TJs and also, for twice as much $$, at WF; also *plain* oatmeal (all brands the same, but make sure it says "Old Fashioned," NOT instant, and NO flavors); Fiber 1 (tastes like cookies to me, has the most fiber of any cold cereal and no sugar).
Cocoa: Droste is a dutch-processed brand that is available at the supermarket; locally I find that the supermarket store brand (Shaw's/Star here in MA), though not dutched, tastes better and has more fiber than Hershey's.
Ricotta: Calabrio fat-free (WF) has 30 cals and 6g protein per 1/4 cup, half the calories of the supermarket brand.
SF syrup: I like Maple Grove Farms (supermarket).
Chicken broth: Health Valley (supermarket or WF) has 25 cals, no carbs and 6g protein per serving.
But Nelie is totally right that one just needs to spend some time in the market reading labels. Happy comparison shopping!