4-pack of Honey Nut Cheerios for $6.39-$7.14 ($1.60-$1.79 per box)

Amazon has got a four-pack of the 12.25 oz. boxes of original Cheerios for $7.14 on Subscribe & Save. (It's listed as an "Add-On" item, but if you buy it through Subscribe & Save, you don't need to worry about any Add-On requirements.)  $7.14 for four boxes works out to $1.79 for each box.

And, as a plus, ordering this Subscribe & Save selections will help you reach the extra 10% Subscribe and Save discount that I talked about here.  Please note that if you fulfill the requirement for five Subscribe and Save deliveries in one month, the price on these Cheerios will drop to $6.39 for four 12.25 oz. boxes, or $1.60 each.

Just a word about Amazon Subscribe & Save: selecting Subscribe & Save is a fantastic way to save money.  It's pretty much risk-free, even if you are doing it just to get the additional discount. You can UNsubscribe to Subscribe & Save very easily, by going to your account as soon as your order has shipped. Even if (worse case scenario) you completely forget to unsubscribe, Amazon will not send out an additional order without shooting you a warning email first, giving you ample time to unsubscribe and cancel any additional orders in time. It's pretty much an all-win proposition. Shipping on Subscribe & Save items is always free, even without a Prime membership.