You could try making your own, I do and it and it works out at about 8.6 g carb a moderrate slice.
100g bread flour wholemeal is best.
100g Wheat Gluten (from "Breadbin")
100g Soy flour (Holland and Barrat)
Flax seed and sunflower seed.
2 tsp of dried yeast
1 tsp of sugar.
A squirt of lemon juice, about a dessert spoonful.
A glug of oil.
Mix it and make it like any other bread, a loaf should give 15 slices, if not it hasn't risen enough!
All my own work!
H
EDIT It makes wonderful toast!