How to buy correctly us vs eu

[Punyelf-draenor (Punyelf)]

EU subscription

World of Warcraft®: Subscription - World of Warcraft | Battle.net

US/NA Subscription

World of Warcraft®: Subscription - World of Warcraft | Battle.net

There are some issues with some services when you are buying them from a different region/currency

Cannot Purchase 120 Char Boost On my EU Account

Hello! I am trying to buy a character boost on my EU account. I keep getting the following error: We see that you are trying to buy World of Warcraft: Level 120 Character Boost in a different region than your Blizzard account region. To complete your purchase, visit the Blizzard web Shop (EU). I only play on my EU account, but I live in the USA. The error prompts me to the EU website to continue my purchase, but that takes me out of game. The problem is that boosts are available for purchase …