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on average people 1TF 2 key = 5.66 Ref (ie 6 Ref)
to get the best deal try a TF2 in game trade server or a tf2/steam trade site such as http://scrap.tf/ or http://www.tf2outpost.com/
for reference TF2 metal goes:
2 regular weps = 1 scrap
3 scrap = 1 reclaimed
3 reclaimed = 1 refined.
I will take the best offer. Don't offer crap.