The discount coupon is only one per subscription per year and can be redeemed just once
I don't understand what you mean for this time.
Shipping is not 10%,can't tell how they charge FOR. Recently I ordered 3 tshirts for a total of 75 GBP and I had to pay 9.99GBP.
If for international fees you mean custom fee, well that's normal when you receive goods from abroad like out of the States or EC