If it’s cheaper to buy bread than make your own you’re doing it wrong.
Good Organic flour is about a quid a kilo of you but it in bulk. Yeast is about 50p for loads. Pinch of salt, wadge of butter/oil if you want it super soft, and some water.
Even when you add in the cost of electricity with our ancient oven, that’s easily less than 70p a loaf.
Even nasty Chorleywood loaves cut with all sorts of crap cost more, let alone stuff that’s not horrible.
They are many accusations you can level at home made bread that are true – yes it can be a faff until you find a rhythm that works for you and your equipment, yes cleanup can be messy if your kneading it by hand, yes results can be unpredictable depending on the yeast, temperature, etc, but cost? Nah, not having that one.