Green Bats Best Bats (and now I finally own one!)

https://backpack.tf/item/2032821765

Sale 1) ?

https://backpack.tf/profiles/76561198002757046#!/compare/1541548800/1541635200

https://backpack.tf/profiles/76561198129995083#!/compare/1541635200/1541808000

Sale 2) Bulk sale

https://backpack.tf/profiles/76561198129995083#!/compare/1542672000/1542758400

https://backpack.tf/profiles/76561198139171368#!/compare/1542585600/1542672000

Sale 3) Bulk sale

https://backpack.tf/profiles/76561198139171368#!/compare/1542758400/1542844800

https://backpack.tf/profiles/76561198114402400#!/compare/1542758400/1542844800

Sale 4) Sold + ~13 Keys of Items for an Aces High Polar Pullover (77.5 Keys)

https://backpack.tf/profiles/76561198114402400#!/compare/1546300800/1546387200

https://backpack.tf/profiles/76561198140316312#!/compare/1546387200/1546473600

77.5 - 13 = 64.5, which rounds to 65 Keys

Sale 5) Sold for a Green Energy Bubble Pipe (54 Keys) + 11 Keys + Bubbling Backbiter's Billycock (10.5 Keys)

https://backpack.tf/profiles/76561198140316312#!/compare/1547769600/1547856000

54 + 11 + 10.5 = 75.5, which I'll round down to 75 Keys

Bubble Mini

https://backpack.tf/suggestion/5c4e3e9acf6c750de0426438 - 54 Keys