With orders of $25 or more, Amazon offers its Prime members the Bob's Red Mill Steel Cut Oats 24-oz. Bag 4-Pack for $7.20 with free shipping. (Non-members can spend $49 or more to qualify for free shipping.) That's about $2 less than you could expect to pay in local stores for this quantity.
Note that this item is part of Amazon's "add-on program" and can only be purchased with an order of $25 or more.