You are going to need the Infant Care book you see in the picture, you can find it in the store.
The Walgreens diapers are buy 1 get 1 free @ 8.99. The Infant Care booklets have a $2 off Walgreens diaper coupon inside. You will only need 1 coupon, and it will take off for ALL the diapers in your transaction.
This is what your deal looks like:
Buy 2 Walgreens packs of diapers for $8.99
Use 1 Infant care coupon (takes off $4)
Total: $4.99 for 2 packs or $2.49 each!
Photo Credit, thanks to Katy Couponers!