I thought to myself: Why doesn't someone make a dark chocolate product sweetened with stevia? A no-brainer, right? Well, it turns out it's impossible to find--almost! There is one place (and only one that I could find anywhere) that sells it. I recently bought some and tried it out--and it's good (IMO)! It's got only 5 net grams of carbohydrate per a 1.6 ounce bar. It's 98% chocolate liquor and 2% stevia It is available here: http://www.melvillestore.com/98-dark-stevia-sweetened-chocolate-bar-1lb.html.

Wikipedia definition of chocolate liquor:

Chocolate liquor (cocoa liquor) is pure chocolate in its liquid form. Like the cocoa beans (nibs) from which it is produced, it contains both cocoa solids and cocoa butter in roughly equal proportion.^[1]

It is produced from cocoa beans that have been fermented, dried, roasted, and separated from their shells. The beans are ground into cocoa mass (cocoa paste). The mass is melted to the liquor, and the liquor is cooled and molded into blocks known as unsweetened baking chocolate (bitter chocolate).

Chocolate liquor contains roughly 53 percent cocoa butter (fat), about 17 percent carbohydrates, 11 percent protein, 6 percent tannins, and 1.5 percent theobromine.^[2]"

One caveat: It is expensive, no doubt about it ($32 for eight bars or 12.86 ounces--not 1 lb. as they say). But if you are like me, you only need a half a bar or less to satisfy. That's 2.5 grams of carbs per serving, and for me that's 16 servings, which will last me about a month.