just moved to the US & comparing the price of everything obsessively ...
a loaf of nice bread (not pre-package, which is inedible here) is about $3 to $7, more if you get something fancy with bits in.
a pack of flour cost $4, and I use a bout 5% of the pack for one loaf. there's butter to go in, but other ingredients, e.g. salt & yeast are less than a penny each. there's the use of electricity of course, but a 'home made' much nicer loaf costs about 50 cents (30 pence) total. if i bought sunflower seeds etc, it would add just a few pennies.
don't buy silly little packets of 'just add water' flour mixes - hugely over priced. buy a decent make of bread flour, as big as you can store.
a loaf only lasts a couple of days here, but i make bread about twice a week, and you can live without it (still not a good idea to eat loads, even home made). it's healthier, as it doesn't have double or treble thte amount of yeast, just to get a 'quick rise' (how supermarkets manage to churn it out so fast) and it has minimal sugar & salt in.
So, each week, I save approx. 5 UK pounds (equivalent)on the cost of bread. which means my breadmaker paid for itself less than 6 months after we bought it, 3 years ago.
oh, and dd is incredibly fussy eater, but LOVES wholemeal bread.