A 3.5-pound bag is sold at grocery and big-box stores for around $2.69, but for only another $0.39, you're getting another 1.5 pounds.
Brad's Deals Editor Marisa,
This five-pound resealable bag of Arm & Hammer Baking Soda drops from $6.99 to $3.08 at Amazon. The next best price is $3.88 at Walmart, and you have to spend a minimum of $30 to ship it. Shipping is free for Prime members. Non-members get free shipping at $25 or with a free Prime trial. Otherwise, shipping adds $5.99. Sales tax is charged in most states.