Resuggestion, thanks to Lemons & Foamy for the info!

Sale 1:

https://backpack.tf/profiles/76561198301574527#!/compare/1536796800/1537228800

https://backpack.tf/profiles/76561198220310565#!/compare/1537056000/1537228800

Sold for Blizzardy Pithy(24.5)

Sale 2:

https://backpack.tf/profiles/76561198220310565#!/compare/1537228800/1537401600

https://backpack.tf/profiles/76561198232697088#!/compare/1537228800/1537401600

Sold for GE Mirror(29.5)

Sale 3:

https://backpack.tf/profiles/76561198232697088#!/compare/1537920000/1538006400

https://backpack.tf/profiles/76561198119149660#!/compare/1537920000/1538006400

Sold for 20 keys

Sale 4:

https://backpack.tf/profiles/76561198119149660#!/compare/1538092800/1538179200

https://backpack.tf/profiles/76561198848059175#!/compare/1538092800/1538179200

Sold with 1 key for Tesla Valley Forge

Use there.

Sale 5:

https://backpack.tf/profiles/76561198848059175#!/compare/1538352000/1538438400

https://backpack.tf/profiles/76561198195731583#!/compare/1538352000/1538438400

Sold with 1 key for PE Polar Bear(36)

Total is 35 keys

Sale 6:

https://backpack.tf/profiles/76561198195731583#!/compare/1540425600/1540512000

https://backpack.tf/profiles/76561198148443577#!/compare/1540339200/1540512000

Sold for 29 keys

Total sales @:

20, 24.5, 29, 29.5, 35 keys

Foamy's + Lemons Part:

The sale was used on the Medi Gun so it can't also be used here

You mean the pithy probably - and yeah, that's gonna be an issue here. That'd make this 30-35

Oh whoops, I actually meant the Polar Bear. Perhaps this needs to be 29 - 30?

yeah then 29-30 will work

Taking 29 - 30 keys