If you have more than one product subscription there are a few details to keep in mind.
Multiple subscriptions can be combined into a single order and the combined total will be used to determine if the order qualifies for free shipping (Total is $60 or more) at the time of processing.
Final shipping cost is calculated at the time the subscriptions are processed (every 2,4,6 or 8 weeks). As long as all of the subscriptions are set up with the same date, interval, shipping method, shipping address and payment information they will be combined into a single order and the total will be used to determine if the order qualifies for free shipping.
When viewing or managing your subscriptions (as in the image above) you may notice that a shipping cost is shown. This is what the shipping cost will be if this is the only subscription that you have. Since the final shipping cost is calculated at processing time, this cost may not reflect what your actual shipping cost will be if you have multiple subcriptions.