Apparently you can get it bellow 2 keys

Backpack.tf

http://backpack.tf/classifieds/search/Festive%20Knife

TF2OP:

Selling For 2 keys:

http://www.tf2outpost.com/trade/8805092

http://www.tf2outpost.com/trade/8795904

http://www.tf2outpost.com/trade/5976105 Selling for 3 keys

http://www.tf2outpost.com/trade/8803003 Selling for 2 keys 1 ref

http://www.tf2outpost.com/trade/6488489

http://www.tf2outpost.com/trade/8563315

http://www.tf2outpost.com/trade/8655511

http://www.tf2outpost.com/trade/8815508

http://www.tf2outpost.com/trade/8806399 Selling for 2 keys 1 ref

http://www.tf2outpost.com/trade/8731204 Offered a festive rocket(needed seller to equal the value)

http://www.tf2outpost.com/trade/8661449

http://www.tf2outpost.com/trade/8816729

http://www.tf2outpost.com/trade/8733985

http://www.tf2outpost.com/trade/8660238

And I sawed just a trade selling for 1key + 3 ref

Sold For 2 keys

http://www.tf2outpost.com/trade/8660238 Sold 1

http://www.tf2outpost.com/trade/7691531

http://www.tf2outpost.com/trade/6488489

http://www.tf2outpost.com/trade/8016807

http://www.tf2outpost.com/trade/7597485

http://www.tf2outpost.com/trade/5672478 Sold 1 for 3 key's

http://www.tf2outpost.com/trade/8759515 Sold 1 for 3 key's

Before Commentig on this item sales check the items history