Post Great Grains Cereal for 75 Cents Per Box at Walgreens

There is  a register rewards offer available at Walgreens through 11/28:

Save up to $4.00 POST Cereal and POST Pebbles Treats YourBucks® Offer in future savings when you buy five or more POST Cereal and POST Pebbles Treats

This offer is advertised on the Coupon Network. You can use this offer to get Great Garins cereal for 75¢ per box

Buy four Post Great Grains Cereal, 13 oz $2.50 each
Use 4 $1/1 Post Great grain cereal printable coupons (will need access to two computers)
Pay $6 and get back a $3 Register Rewards

UPDATE: It looks like you can only print one coupon per computer.

Thanks, Wild for Wags!