How many trading cards can i get for 1 csgo key?

140

Not worth it, trust me ;)

Just sell it on the market and buy cards with the wallet money,

About 20 full sets.

cards or sets?

probably 1:22 at this rate (1 key = 22 sets)

19 card sets, I think

I know at least 2 bots selling 20 cards set for 1 CS:GO key (just don't expect good cards, all from free / super cheap games for sure), the guy above said 22 sets, you should ask him for more details. The nice thing of these bots is they can read your badge page and only give you sets you haven't reach lv5 yet. So convenient!