Battle.net Gift cards
Buying up to 60$ In Giftcards worth of CSGO keys.
They must work for Europe!
Vouches: https://www.mpgh.net/forum/showthread.php?t=1122469
Proof: https://gyazo.com/630dfbf7dc1fb8b2a6fe9b4e2f4dbcf3
Will only go first if you are highly vouched!