i also found 5 gametime cards each worth 60 days...for 1 euro each^^
was the reason i started to play this game...then got a collectors edition (with the t-shirt) for 10 euros on amazon.
when i ran out of gmaetimecards i bought an additional silver edition and a 2 digital versions for together 12 euros worth 3 month gametime + some ingame goodys.
thats about 27 euros for 13 month playing...then it went f2p
PS: i also asked around in different stores for additional gametimecards...came accross another 3, but by the time i got to the shop, which was a little outside of town, they had thrown them away already