Shipping rates vary depending on location.
USA: $8.99 per box.
Canada: $14.99 per box
Worldwide: Various - please see this article for a list of international rates.
The shipping cost is PER BOX. If you purchase the 3-Month Plan shipped within the US, you will be charged $86.98 USD for the subscription and 3 x $8.99 USD for shipping.
All prices are in USD. Any applicable State, Provincial or National (UK VAT, AUS GST, etc) taxes are applied at checkout.