Generally when I see a list of items I am purchasing, a "continue to checkout" button, and a right sidebar that covers the full height of the checkout area, the right sidebar does not contain additional services that I am purchasing. I would, in fact, expect services that I am purchasing to appear in the same list as the items that I am purchasing! In this instance I looked at the right sidebar only because I was looking for the "obvious" indication of the subscription, and even then I had trouble finding the bit that told me that purchasing a single pair of boots would cause me to be signed up, because it is in a sub-header in one of the lowest-contrast parts of the sidebar.
