Sourdough Purchase is a term used to describe the purchase of a LOAF of sourdough bread. Sourdough bread is made from a fermented dough that has been left to rise for a long period of time, resulting in a unique flavor and texture. It is a popular type of bread that is often used in sandwiches, toast, and other baked goods. The term 'Sourdough Purchase' is used to refer to the purchase of a LOAF of this type of bread.