@sylver Thanks for the information. I didn't realize it because I didn't see it yesterday, but indeed, having Prime service, for the Razer Naga X besides Amazon UK there is a German seller.

I just talked to Amazon and they confirmed that in their order, once placed, if in the shipping costs section there is no extra customs fee, it means that there is no such cost, so in the end I am going to buy the Razer Naga X from Amazon UK and they will deliver it tomorrow, so I will be able to confirm firsthand if it is true that they don't charge customs duties, because when placing the order there was no mention of any extra.

Thank you very much for the help offered, when it arrives I will comment on how the delivery is and if I have had any problems.