[cynwoody]

There is abundant prior art on this one.

E.g., one casualty of the dot-com bubble was Streamline, an online grocery delivery company. They called their version of the invention Don't Run Out. Fast Company raved about it in this article dated July 31, 1998:

    What happens when customers depend on you - and you deliver?
    They decide to depend on you even more. One of Streamline's most
    popular services is called Don't Run Out. Families identify
    their must-have items - milk, toilet paper, diapers, pet food -
    and authorize the company to replenish their stock of each item
    automatically. Today almost every Streamline household uses
    Don't Run Out. The average household has standing orders for
    more than 10 items. "It's extraordinary," says [Gina] Wilcox. "The
    consumer makes a purchase decision once, and we fill the order
    throughout the year. It redefines brand loyalty. It redefines
    marketing."

http://www.fastcompany.com/34524/streamline-delivers-goods