Amazon might quickly point out that its Prime service comes with speedy two-day shipping on most orders, whereas Target’s free shipping might take five or more days to arrive after the time of purchase. But remember, with the Subscriptions service, we’re talking about staple household items needed on a regular basis: The big attraction of this service is that it helps you stock up on items before you run out, not when you’re in desperate need. So expedited delivery, while nice, doesn’t seem essential.