Many sellers have provided their shipping policy. You can view this information in two places:

Your Order Confirmation page will show the shipping policy after placing your order:

You can also see the shipping policy on the My Subscriptions page on the subscription card for your subscription:

Clicking the "Shipping Policy" link will bring up a popover with the seller's shipping policy:

In instances where a shipping policy isn't provided, you can contact the seller directly to ask.