Pure De-lite chocolate bar, only 1.1 gr carb for a 38gr bar (173 cal).

it's dark chocolate, actually tastes like chocolate, none of that nasty aftertaste.

found them at Choices, $2.49 each (!).

they have milk chocolate ones too, with flavours (almond, mint, orange) but they're about 3.5gr per bar (the milk solids, one assumes).