Last year Amazon lowered Subscribe & Save to a 5% savings except for 20% for diapers and wipes for Amazon Mom members.
Now you can get back up to 15% by having at least 5 subscription items. Diapers and Wipes count towards the 5 items, however you only save 20% on those if you have Amazon Mom.a free trial of Amazon Prime. A prime trial is also free with Amazon Family (which also gets you up to 20% off diapers among other benefits) or Amazon Student. EBT/Medicaid Cardholders can save on Prime Membership here.