So, this is a little leftfield - but really just an extension of my recent system amendments. I now have some components I’m looking to move on to new homes. Obviously, I’m not attempting to drum up any sales interest here. It’s more about streamlining the process and adding in some efficiencies really.
As I moved to California from the UK, I will most likely find buyers there; as all the units are 240V. Calculating the combination of shipping and customs duties has me baffled. During the process of preparing to list these items, I’ve wrangled all the other info required - inc all the necessary photographs. But the shipping and customs aspect of it has been unexpectedly challenging. 
Has anyone here who has previously sold Naim Audio components, used a service which;
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Is easy to navigate and calculate quotes?
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Has the option of calculating import customs brokerage - depending on destination?
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Is cost effective and reliable?
Many thanks in advance! 
Dan