Very rare to find these on sale and buyers are happy to pay more for it than the current price.

http://www.tf2outpost.com/trade/8682602 I had this trade up for 1 week on autobump and didn't get anything.

http://www.tf2outpost.com/trade/8811576 Several people offering 3.33 and one person offered a key. I bought one for 3.66.

http://www.tf2outpost.com/trade/8992099 Sold almost instantly for 3.33.

http://www.tf2outpost.com/trade/8811149 Someone offered 1 key and 2 ref.

http://www.tf2outpost.com/trade/4922721 Buying for 3.33.

http://www.tf2outpost.com/trade/1801155 Buying for 3.33.

http://www.tf2outpost.com/trade/8765748 Buying for 3 ref but failed.

http://www.tf2outpost.com/trade/8947077 Buying for 3 ref but failed.

http://www.tf2outpost.com/trade/8941290 Buying for 3 ref but failed.