Your rewards will be mailed from Italy, and every precaution has been taken to make shipping fees less pervasive. As stated in the campaign page, they are set to the bare minimum to ship rewards internationally, using all the available weight for any price range.
If you have tried switching rewards, you might have noticed that shipping fees are (of course) proportional to the amount of sets included:
€5 for 1 full set (parcel weight is 50g)
€7 for 2 full sets (parcel weight is 100g)
€10 for 3 full sets (parcel weight is from 100g to 250g)
Only €5 more are charged for all destinations outside Europe, Canada, United States.
To contrast the higher shipping fees when getting more sets, all combos of two sets were discounted from the start by €1 (over an increase in fees of €2), and the trilogy by €3 (over an increase in fees of the same amount).
If you didn't find the reward you wanted, because it was sold-out or because you wanted more of the same sets, you can proceed to build your custom bundle through add-ons in the pledge manager, and the shipping fees will increase in proportion to weight and destination, to align with those asked for comparable reward tiers.
Thanks to the Stretch Goals, the main add-ons in the pledge manager are now being discounted to help balance also increments in shipping fees due to heavier parcels.
Add-ons fees for the €5 HAL d20.01 rewards, which will be fullfilled a bit later (being completely custom bundles) will be calculated in the pledge manager, but not charged.