In regards to the US import tax issue with private shipping companies like UPS, Fedex, and DHL.
UPS are DEFINITELY tax Nazi's on packages valued over $300. They check EVERY BOX it seems. I just paid about 7% on a UPS package from abroad.
Use US Postal Service if you can, buyers. I have bought multiple pairs of C&J shoes from the UK, and never paid any taxes. USPS doesn't have the manpower or doesn't have the will to check every package.