some trades i gathered showing i sold a few keys for 5.66 each.
http://i.imgur.com/9cnjxQc.png (Haunted Soul was a gift)
http://i.imgur.com/DS7d13S.png (The famous Crate - A - Day)
And my outpost trade, sold about 20+ keys there for 5.66: http://www.tf2outpost.com/trade/11660037
Hope this helped.
provided by techtoast
http://www.tf2outpost.com/trade/12169061 bot buys at 5.55
http://www.tf2outpost.com/trade/12312609 nother key bot at 5.55
http://www.tf2outpost.com/trade/11076954 nother key bot at 5.55
http://www.tf2outpost.com/trade/11851316 nother key bot at 5.55
keybots dominate the market.
I have a friend buying at 5.66 but I will not disclose his name as he provides other profitable services to me.