Our local Food Pavilion Store is making a 3g net digestable loaf for $2.99. So far I find their bread better than others I have tried.
The unit cost for the homemade version of this bread, and it's about .92, and can become even less with the bulk purchase of the ingredients.. IE: 25 lb. speciality flours are about 40% less than a 4# bag.. You store is selling a low carb bread at a fair price.. :)