Wow, this needs a raise.

Sale 1: http://backpack.tf/profiles/76561198129617464#!/compare/1484956800/1485216000

Should be used to price the Killer's Kabuto.

Sale 2: http://backpack.tf/profiles/76561198129617464#!/compare/1485216000/1485561600 - Bulk

Sale 3: http://backpack.tf/profiles/76561198125447760#!/compare/1486252800/1486339200

Sold for 70 keys pure.

Sale 4: http://backpack.tf/profiles/76561198125447760#!/compare/1486684800/1486771200

Should be used to price the Grimm Hatte.

Sale 5: http://backpack.tf/profiles/76561198033378852#!/compare/1487462400/1487548800

Sold for a Clean Scorching Flames Noble Nickel Amassment of Hats (87,5 keys, meh 88) + 10 keys pure

88 + 10 = 98 (100)

Sale 6: http://backpack.tf/profiles/76561198309937181#!/compare/1487548800/1487635200 - Bulky

Sales at 70 and 100. Sellers at 65 keys (fresh) and 90 keys (unsold for 4 months). Going with a range of 70-90. (Sellers: http://i.imgur.com/gPxKc2E.png)