Regional FlagAre game (time) cards being phased out?Source
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#1 - 2018/02/22 11:14:00 PM
Because they're get harder & harder to find on sale.

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#11 - 2018/02/23 12:55:00 PM
The old 60-day game cards have been retired a while ago already, although you may still have access to old stock in some stores.

Nowadays you can instead purchase balance cards for the same amount 60 days would normally cost, which is 25.98 in Euros.

As Penya mentioned, you can find a list of local stores here:

You would then be able to purchase game time directly from the Blizzard Shop: