My first Australium weapon I got from mvm :D

Classified ads at the time of posting:

Page 1 - http://m.imgur.com/wxcB95T

Page 2 - http://m.imgur.com/4dW4lLQ

Page 3 - http://m.imgur.com/HP09Q3f

http://backpack.tf/classifieds?item=Blutsauger&quality=11&tradable=1&craftable=1&australium=1

1*10.74 keys

9*11 keys (4 have killstreak, 2 have parts attached and 1 has Exorcism)

4*11.5 keys (3 have specialized killstreak, 1 has killstreak and 1 has parts attached)

1*11.56 keys (Has specialized killstreak)

1*11.87 keys

6*12 keys (2 have specialized killstreak and 1 has killstreak)

Unsolds at 12 keys:

http://www.tf2outpost.com/trade/27344745 (Has 2, 1 has killstreak, ~6 days)

http://www.tf2outpost.com/trade/27336414 (~1 week)

http://www.tf2outpost.com/trade/27353566 (Has killstreak, ~4 days)

http://www.tf2outpost.com/trade/27377241 (Young)

http://www.tf2outpost.com/trade/27373525 (~1 day, young)

Unsold at 11 keys and 9 refined (~11.6 keys):

http://www.tf2outpost.com/trade/27348016 (~5 days, has specialized killstreak)

Unsolds at 11 keys and 8 refined (~11.5 keys):

http://www.tf2outpost.com/trade/27357440 (Has killstreak, ~4 days)

http://www.tf2outpost.com/trade/27375533 (Has specialized killstreak, young)

http://www.tf2outpost.com/trade/27375574 (Has specialized killstreak, young)

Sellers at 11 keys:

http://www.tf2outpost.com/trade/27368446 (Has killstreak and parts attached, ~2 days old)

http://www.tf2outpost.com/trade/27374572 (Has killstreak, ~1 day old)

http://www.tf2outpost.com/trade/27379621 (Young)

http://www.tf2outpost.com/trade/27365738 (Has killstreak, ~2 days old)

http://www.tf2outpost.com/trade/27377539 (Young)

http://www.tf2outpost.com/trade/27366782 (Has buildings destroyed, ~2 days old)

http://www.tf2outpost.com/trade/27341217 (~6 days old)

http://www.tf2outpost.com/trade/27376340 (Young)

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