Amazon offers the Bob's Red Mill Old Fashioned Rolled Whole Grain Oats 32-oz. Bag 4-Pack for $11.08. Add it to your cart via Subscribe & Save to drop it to $10.53 and bag free shipping. That's about $3 under what you'd expect to pay for this quantity in local stores.
Be sure to cancel Subscribe & Save after your order ships or you'll be billed for subsequent shipments.