The bills you are getting is the 4.9% import duty you have to pay when importing good from outside the US.
As well as the duty there is a small 'merchandizing fee' on top.
Anyway you should all feel smug because the DIYers in the EU have to stump up 19% Value Added Tax for the same goods from Hypex.
And as pointed out, the shipper (UPS) collects this for Uncle Sam !!
Enjoy the NCORES