Shop › Plain Sourdough Round Loaf Plain Sourdough Round Loaf $10.00 Made with King Arthur organic bread flour, sourdough starter,salt, and spring water. Frequency: One time purchase $10.00 Subscribe Save 20% Sale Price: $8.00 Original Price: $10.00 Every month • For 3 payments Add To Cart Added! Made with King Arthur organic bread flour, sourdough starter,salt, and spring water.