Year old price. Only 1 recent usable sale.

Sale :

Before : http://backpack.tf/profiles/76561198042251117?time=1443682800

After : http://backpack.tf/profiles/76561198042251117?time=1443942000

Sold for a Dead Presidents Mask of the Shaman ( 77 ) + a duped Knifestorm Industrial Festivizer ( 76 ) + a Molten Mallard Private Eye ( 52 ) : 205 * 0.9 = 185 keys

Mini on the shaman :

http://backpack.tf/vote/id/5621e6eab98d88da5fcc1b3c

77 keys

Mini on the duped festivizer :

Before : http://backpack.tf/profiles/76561198162778494?time=1436770800

After : http://backpack.tf/profiles/76561198162778494?time=1436857200

Sold for a Kill-a-Watt Deep Cover Operator ( 59 ) + a Terror-Watt Shooter's Sola Topi ( 17 ) : 76 keys

Mini on the private eye :

Before : http://backpack.tf/profiles/76561198049845322?time=1442300400

After : http://backpack.tf/profiles/76561198049845322?time=1442386800

Sold for a Time Warp Desert Marauder ( 68 ) but a Steaming Hotrod ( 16 ) was added : 68 - 16 = 52 keys

Taking the flat price oif 185 keys.

Supportive criticism welcome