This is an invoice I paid today. The shipment was shoes from USA with a cost of 240$.
It depends on how shopandship will set the "cost of value" of the shiment in your account, make sure to check that. They may set it 700$ or 300$ or 500$. You can upload the invoice and contact them if something went wrong.
Between, if you have S&S Flex the shipping cost will be 29$