Should You Cancel Prime? Here Are 12 Good Reasons
Free Delivery Marketing: The Impact Of Offering Free Shipping
Free Shipping Minimum Purchase Increased from $25 to $35
Prime vs. Business Prime: Cost, benefits, more
Chart: Free Shipping Is Prime's Key Feature
What happened to Prime 2-day shipping? - Vox
Extends-Holiday-Free-Shipping-Promotion-to-December-18-and
adds to Business Prime benefits, including new credit card
drops free-shipping minimum for all customers