These US tariffs from my last build July 2013, 2x SMPS600, 2x NC400, building right now:
Amps $853.13 x 4.9% = $41.80
Power supplies $472.50 x 3% = $14.19
UPS broker fee $7 same as last three
I don't know if the spit tariff rate is new or not. Didn't look that closely before. I don't think there's any way around paying tariff. My customers complain about it. I ship exclusively USPS and they seem to charge tariff everywhere I ship worldwide.
With our guitar/violin seasoning device, one of our international distributors said it's possible to deduct a prior paid tariff (into USA for example) from a tariff paid later (when I ship to Europe). No idea if it's true.