I bought mine for 11 keys.

Sold mine to the link below for 12 keys

http://www.tf2outpost.com/trade/16973424

and then he says he would sell for 12 keys (I guess he saw the trade one week old unbought at 12)

http://www.tf2outpost.com/trade/15811427

Got some good offers, but none are still valid, and most are old

http://www.tf2outpost.com/trade/16771970

BO of 12, 1 week old, bumped every few hours it looks like, NOT TAKEN

http://www.tf2outpost.com/trade/16219643

asking 20 keys *lel* no offers in 3 weeks

http://www.tf2outpost.com/trade/16770658

'quickselling' for 12 keys, 1 week, autobumped, no luck