Guild Wars 2

Hi,
I am player from Europe, and i wish to buy gem card.

http://www.amazon.com/Guild-Wars-2-Gem-Card-PC/dp/B009AYOFI0

Will this one work for any EU GW@ account ?

Likely not, cause amazon is mostly orientated on the US, and you cant use NA cards on accounts bought in the EU.

I also think there are plenty of european alternatives, and for the same or better price

While Amazon originates from the United States, they have different websites (.com, .ca, .co.uk, .de, .fr, etc.) that offer products for those specific countries and regions. You should look on your regional Amazon website. For example:

UK:
http://www.amazon.co.uk/Guild-Wars-Gem-Card-DVD/dp/B00935B4O4/ref=sr_1_1?ie=UTF8&qid=1393260233&sr=8-1&keywords=gem+card+gw2

Germany:
http://www.amazon.de/Guild-Wars-2-Gem-Card/dp/B00935B4O4/ref=sr_1_1?ie=UTF8&qid=1393260327&sr=8-1&keywords=gem+card+guild+wars+2

France:
http://www.amazon.fr/Carte-2000-Guild-Wars-pour/dp/B00935B4O4/ref=sr_1_1?ie=UTF8&qid=1393260355&sr=8-1&keywords=gem+card+guild+wars+2

etc.