These are the lowest carb tofus I've found in my supermarket. Both have 0 carbs per serving with less than 1 gram fiber. Personally, I would still count it as 0.5 grams per serving to make up for any labeling fudges.
Nasoya LITE Firm Tofu
Nasoya LITE Silken Tofu
Nasoya LITE Firm Tofu
Nasoya LITE Silken Tofu