Currently in the cart there is no way to enter 3 fixed locale specific ship costs as you outlined. The shipping options that are supported today that are locale/country specific are the real time shipping calculator, shipping by zip/country and the domestic/international handling technique described below.
In the next release cart version 3.96 we are adding shipping by zone that will support what you described. The new shipping by zone feature supports the following:
- Shipping zones (country and/or state/locale).
- Fixed shipping costs by zone.
- Shipping by order quantity and by zone.
- Shipping by weight and by zone.
In the interim until shipping by zone is released you can configure shipping as follows:
1. Check free shipping
2. Enter a handling charge to both domestic and international
3. Check combine shipping and handling
When you configure shipping this way the cart will compute a fixed shipping cost (the cost entered for handling) for both domestic and international orders.