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There's a surpisingly high amount of these on the market, but the majority of them are in sets.
3.5 keys:
http://www.tf2outpost.com/trade/22228885 2 days
4 keys:
http://www.tf2outpost.com/trade/22148189 5 days
http://www.tf2outpost.com/trade/22131826 6 days
15 keys:
http://www.tf2outpost.com/trade/22252560 gud diel
gud diel upvoteGood proof upvote