It's A Secret To Everybody Unusual Big Elfin Deal, definitely needs it price change.

Link 1

http://www.tf2outpost.com/trade/9828953

~Only one on outpost. His b/o is 6.5 buds.

~C/o is is 2 bp's. Worth less than 6buds.

Link 2(Same hat but previous owner)

http://www.tf2outpost.com/trade/7521036

~Sold his Elfin at $180. Approximately (now) 4.8buds.

Since this hat is being sold at different prices; I think the hat should be valued at similar tier effects, such as Burning Flames(6.5) and Cloudy Moon (6.9buds).