I've never paid customs for anything coming from China/Malaysia/Indonesia/Singapore through the post office for orders on eBay, Banggood or Etsy. The checkout price is the only amount I paid. The smallest order was this one at $3 something, and the largest order was something from Etsy for $150.
I was charged customs on paper (I mean I bought exotic writing parchment) from Hong Kong with FedEx and Japan with DHL. I was also charged for anything coming from the west, whether UK or US, courier or regular post. Also, orders that came through the post office from Germany were never charged customs either (all of my Makerbeam stuff — search the forum).
So I look for stuff that ships through the post office and have avoided package forwarders or couriers for most of the stuff I want to get.