ALDI has a good sliced sourdough loaf for a good price (under $4).
https://www.southernliving.com/aldi-sourdough-review-11878321
It has really been putting a dent in my low-carb diet since discovering it a few weeks ago...
Is it real sourdough, made with sourdough starter? My local grocery sells Goldminer brand sourdough products — quite popular — that don’t contain any sourdough starter. It’s just regular bread with edible acids — citric acid and such — to give it a slightly sour taste.