Price is three months old, and you'd have to have ninja-speed to catch the sellers at the current price. The market for the Strange Half-Zatoichi is saturated with almost 85% killstreak weapons, and 2 ref trades almost never stay open for more than half an hour.

An update is needed.

Sellers

http://www.tf2outpost.com/trade/18145758 --- 2 ref -- Sold within 3 minutes

http://www.tf2outpost.com/trade/18164478 --- 2 ref -- Got an add within 3 minutes of making the trade

http://www.tf2outpost.com/trade/18146828 --- 2 ref -- Sold within 20 minutes of making the trade

http://www.tf2outpost.com/trade/18145050 --- 2 ref -- Sold in 22 minutes

http://www.tf2outpost.com/trade/18171619 --- Sold for 2 ref in 6 hours

http://www.tf2outpost.com/trade/18162704 --- Sold for 2 ref in <19 hours

http://www.tf2outpost.com/trade/18174398 --- 3 ref (has two buyers in 10 hours. Appears to have sold all four, according to his BP)

http://www.tf2outpost.com/trade/18165857 --- Willing buyer at 3.66 (has Soldiers killed part. Factoring in his valuing of the part, the Zatoichi would sell for about 2.66)

Buyers at or above current price

http://www.tf2outpost.com/trade/18185092 --- 2.00 (new)

http://www.tf2outpost.com/trade/18184285 --- 2.00 (new)

http://www.tf2outpost.com/trade/18161123 --- 2.22 (20 hours)

http://www.tf2outpost.com/trade/18182907 --- 3 ref

Classifieds

http://backpack.tf/classifieds/search/id/52d221754dd7b8173c8b4568 -- None for sale except killstreak variants! How useless!

Unfortunately due to the small volume its hard to me to pinpoint where the maximum price falls, so I went with the price of the highest buyer and the only real successful sellers, even though one (at 3 ref) seems to be selling his stock rather quickly (or would be if he was online)