Kill-a-Watt is twice the price of Terror-Watt? I think not.

Still higher than I expected.

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Pure Sales:

Sold for 19 Keys:

AxooN: http://backpack.tf/profiles/76561198090278303/#!/compare/1457856000/1457938800

NuKey: http://backpack.tf/profiles/76561198159661472/#!/compare/1457856000/1457938800

Item Sales:

Bulk Sale for Secret Nanobalaclava:

Lolbit: http://backpack.tf/profiles/76561198168316519/#!/compare/1457683200/1457769600

AxooN: http://backpack.tf/profiles/76561198090278303/#!/compare/1457683200/1457769600

Other hats involved are all outdated, not using.

Sold for Bubbling Charmer's Chapeau (19-21 Keys):

Nukey: http://backpack.tf/profiles/76561198159661472/#!/compare/1459123200/1459209600

Razor: http://backpack.tf/profiles/76561198138403415/#!/compare/1459036800/1459123200 (wasn't parsed, but histories confirm this sale)

Chapeau is updated: http://backpack.tf/vote/id/56cb0d72ba8d88002de62523

Sold for Australium Minigun (20 Keys):

Fluttershy: http://backpack.tf/profiles/76561198154200231/#!/compare/1459123200/1459209600

Sunless: http://backpack.tf/profiles/76561198043614216/#!/compare/1459123200/1459209600

Minigun is updated: http://backpack.tf/vote/id/56e0e3dedea9e98326b9de18

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So, sales of 19, 19-21, and 20. Going with 19-21 here.