Amazingly pretty close to the previous suggester's price based on a B/O. This has more range.

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http://www.tf2outpost.com/trade/25113316

Sold for 17 keys

http://backpack.tf/profiles/76561198102767953?time=1424332800 (February 19th)

http://backpack.tf/profiles/76561198102767953?time=1424419200 (February 20th)

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http://www.tf2outpost.com/trade/25135912

Quicksold for 15 keys Outlier

http://backpack.tf/profiles/76561198048757103?time=1424505600 (February 21st)

http://backpack.tf/profiles/76561198048757103?time=1424592000 (February 22nd)

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http://www.tf2outpost.com/trade/22791279

Sold for Blizz Ketche (13 keys) + Bubbling Counterfeit Billycock (12 keys)

http://backpack.tf/profiles/76561198052990918?time=1424764800 (February 24th)

http://backpack.tf/profiles/76561198052990918?time=1424851200 (February 25th)

(13 + 12) * 0.9 = 22.5 keys; rounding down to 22 keys

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Sold for a TF Logo Dread Knot (12 keys)

http://backpack.tf/profiles/76561198052990918?time=1424851200 (February 25th)

http://backpack.tf/profiles/76561198052990918?time=1425196800 (March 1st)

Dread Knot: http://www.tf2outpost.com/trade/25152470

Since the Impaler had no Outpost trade it was most likely offered on the Dread Knot valuing this sale at 12 keys. Outlier