Costco: Arm & Hammer, Pure Baking Soda, 13.5 lbs shipped $11 (.82/lb) in store $9 (.67/lb) free shipping with $75 order) Thumb Score: 0 Costco: Arm & Hammer, Pure Baking Soda, 13.5 lbs shipped $ 11 (.82/lb) in store $ 9 (.67/lb) [costco.com] Good deal if you are in the store and need it. Slickdeals Hot Deals Forum