*UPDATED SUGGESTION!*

Sale 1 (20 key pure sale):

https://backpack.tf/profiles/76561198057671085#!/compare/1541203200/1541721600

^

Bought for Terror-watt Armored Authority (17.5 keys value + roughly 6 refined metal in sweets):

https://backpack.tf/profiles/76561198057671085#!/compare/1539129600/1539820800

^

Terror-watt bought for 15 keys:

https://backpack.tf/profiles/76561198057671085#!/compare/1511654400/1511913600

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Sale 2 (17 keys):

https://backpack.tf/profiles/76561198156255538#!/compare/1541548800/1541635200

Credits for providing 'Sale 2' to me go to Xergoyf, thank you!