Why are duties and taxes "x" amount? They should only be "y" amount.

When you have the option for the shipping service Fedex with taxes included, it will include all charges and fees to have the product arrive to your door. This includes, but is not limited to, import fees, taxes, fuel surcharges, warehouse charges, currency conversion, customs handling.

If this option is what you is used during check out, the product will arrive to your door without any additional costs.