Online Savings and Coupons for Diapers.com

Diapers.com (1-800-Diapers) has a series of coupons and specials. Here are a few:
$10 Off Your First Order of $50 or More Plus Free Shipping (Use Coupon Code: AFFL10) - Expires 12/31
20% Off All Newborn Diapers
Save 15% on Seventh Generation Products with Discount Card
Save 10% on Similac Products with Discount Card

The nice thing about their coupons is I found out they are stackable. This means you can apply one coupon code or special on top of another (e.g. new customer $10 off + 10% Similac + free shipping). This can make their prices very competitive.

One more note: Orders of $15 or more qualify for a free subscription to Parenting magazine. If you already have a subscription, it will be extended one year.