Google express has Pampers Swaddlers Size 4- Economy Pack Plus (144 diapers) for $33.87.
Apply the code GOSHOP20 and get 20% off your order. I believe you have to be a new customer. I bought two boxes and came to $58.27 for the two boxes (tax included, free shipping) which came to $29.13/ box. I think you can find equally good deals for other sizes. Not the best deal in the world, but its tough finding Pampers deals these days.