Team Fortress 2
Counter-Strike: Global Offensive
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scm at 2.9 keys
Lowest price at your own link is $6.00 usd 6/2.5 per key is 2.4 keys.
key was 1.95$ at the time on mp.tf, its 1.93$ now https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key