With orders of $25 or more, Amazon offers the Arm & Hammer Baking Soda 5-lb. Bag for $3.41 $3.88 with free shipping. That's tied with our mention from two weeks ago, $4 off list, and the best price we could find.

Note: This item is part of Amazon's "add-on" program and can only be purchased with orders of $25 or more.