I love the PRia bars, only 4 carbs (or less) each. And to boot, they are the cheapest fo the lot. I get them at Costco and they run about a buck a piece (18 dollars a box)
Of course if you don't like choclate you are out of luck. They come in an assortment of 4 types, all choclate based. One has carmel, one peanut butter and I don't remember the other two, but I love them. Eat them with a big glass of water and you are set.
They also are not dry like some of the other bars, if you know what I mean. you actually feel like you are eating something you might eat if you weren't trying too lose weight.