Hi hummin'!
when the choccy cravings come i buy bars of "green and blacks" 70% cocoa solids chocolate - it has just 45.5g carbs per 100g - because its bitter sweet and lovely and strong you'll get a great chocolate kick out of the smallest piece and will certainly satisfy your chocolate craving....in fact they do it in 20g bars - works out around 8g per bar! - green and blacks is sold all over the place, i get it from sainsbury's (i've bought the 20g bars from holland and barrett)...it's delicious!
hope this helps!
best regards
ax