This deal has ended.
Amazon has a very good deal on diapers: spend $99 on Pampers or Luvs and get a $30 promotional certificate (it is a coupon code that comes via email on May 11). Packs of Pampers Cruisers are only $33.73 (size 4 is a 124-pack; size 3 is a 148-pack) so buy 3 packs for $101 and get $30 back. That is 444 Pampers for net $71, or $0.16 each. Shipping is free and, relative to your local store, there is no sales tax either.