For Prime members only, Amazon discounts a selection of Seventh Generation Overnight Diapers 4-Packs when you clip the 35% off coupon on the product page and order via Subscribe & Save, as listed below. Plus, all orders qualify for free shipping. The deals, with prices after discounts:

• Seventh Generation Baby Free & Clear Stage 4 Overnight Diapers 24-Count 4-Pack (96 total) for $19.78 (pictured, $0.21/diaper, low by $23)
• Seventh Generation Baby Free & Clear Stage 5 Overnight Diapers 20-Count 4-Pack (80 total) for $19.78 ($0.25/diaper, low by $23)
• Seventh Generation Baby Free & Clear Stage 6 Overnight Diapers 17-Count 4-Pack (68 total) for $21.60 ($0.32/diaper, low by $21)

Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.