As I've experienced it Ebay offers a global shipping program. When I buy ponies from the US and the seller uses this method I pay shipping plus tax (two prices shown in the auction which will of course add up) and the company in between (Pitney Bowers I think it was) takes care of all the custom stuff and you get your package right away without having to pick it up at customs and paying there. I just have to guess here but I think that is what you mean.
For Germany for example there is an import fee of 19% on every article worth more than 22€ including shipping, above 150€ you have to pay an extra charge, don't know what it is called exactly in English.
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