This needs a drop.

Classified ads at time of posting:

http://backpack.tf/classifieds/?item=Archimedes&quality=1&tradable=1&craftable=1

2*2.37 keys (2 keys and 7 refined)

1*2.51 keys (2 keys and 9.66 refined)

Unsold at 2 keys and 12.33 refined (~2.6 keys):

http://www.tf2outpost.com/trade/26005756 (~3 days, never bumped)

Unsold at 2.6 keys:

http://www.tf2outpost.com/trade/25797912 (~3 weeks)

Sale at 2 keys and 10 refined (~2.5 keys):

http://www.tf2outpost.com/trade/26007741

Sellers at 2 keys and 7 refined (~2.4 keys):

http://www.tf2outpost.com/trade/26026066 (~1 day old, relisted from http://www.tf2outpost.com/trade/26014977)

http://www.tf2outpost.com/trade/26014997 (~1 day old)

This is all I could find on Outpost that are valid at the time of posting.