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Amazon [amazon.com] has Arm & Hammer Pure Baking Soda, 8 oz for $ 0.72. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).

Product Description from Store[list][*]America’s #1 trusted Baking Soda brand[*]Versatile, effective and affordable solution for over 170 years[*]Use for baking, cleaning, deodorizing and more[*]Free of harsh chemicals and gentle enough to use on many surfaces