I like Greens + Protein bars. Search the forums for info on greens+, its excellent. The flavor is the bars is actually pretty good.
Greens+ Protein Bar Peanut Butter and Chocolate 12/Box - Greens Plus - Best Price Nutrition
thats a random site i pulled up with the bars. You may find a better deal elsewhere. Note that they are not low carb. Somewhere between a name brand protein bar and a powerbar in terms of macros.