Amazon offers the Happy Baby Organic Probiotic Baby Cereal 7-oz. Canister 6-Pack for $14.29. Add it to your cart via Subscribe & Save to drop the price to $13.58. With free shipping, that's at least $7 less than you'd pay at a local retail store. This organic multi-grain cereal contains DHA and Choline, iron, and probiotics.
Of note, non-Prime members can sign up for a free Amazon Prime trial to drop the price further to $11.43 with free shipping via Subscribe & Save. (Click the "Join Prime" box on the product page, located directly beneath the price, to obtain this offer.)
Be sure to cancel your subscription once your order arrives to avoid being billed for subsequent shipments.