Get Seventh Generation diapers on Amazon for $7.50 a pack shipped with their e-coupon and subscribe & save.
Clip the $4 e-coupon and then select the subscribe & save option to get the price down from $19.99 for a two pack.
You get two packs of diapers for $14.99 shipped when you choose these two options, making each pack just $7.50 each (excluding sales tax).
If you are an Amazon Mom member, the price is even lower as you save 20% off diapers and wipes.
Note: These deals ship for free with Amazon Prime, Subscribe & Save or Super Saver Shipping over $35. Amazon Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on amazon.com at the time of purchase will apply to the purchase of this product.