Update: It seems like once you print from one site it shows as already printed on the other two sites. Hopefully you can find a friend that can get you a thrid coupon.
If you have a Safeway store (or one of its affiliates: Dominicks, Randall’s Tom Thum, etc) around you then it’s time to stock up on Cheerios cereal. Currently the store has Cheerios on sale for $1.49 each box when you buy three boxes. Use the following printable coupons for Cheerios cereal to get it for $0.49 each.
You can print this coupon twice at each site so you could get at least six of these coupons per computer.
Thanks Frugal Adventures!