sale #1 - https://marketplace.tf/items/tf2/31101;5;u138 | https://backpack.tf/item/8366217385

$99.99 / $1.70 = 58.82 keys

sale #2 - https://marketplace.tf/items/tf2/31101;5;u138 | https://backpack.tf/item/8368432480

$130 / $1.68 = 77.38 keys

sale #3 - high

https://backpack.tf/profiles/76561198062756330#!/compare/1586217600/1586304000

https://backpack.tf/profiles/76561198972047944#!/compare/1586217600/1586304000

sale #4 - 25 keys

https://backpack.tf/profiles/76561198136707714#!/compare/1582070400/1584489600

https://backpack.tf/profiles/76561198928347702#!/compare/1581984000/1582070400

sale #5 - 39 keys + strange pistol

https://backpack.tf/profiles/76561198928347702#!/compare/1584403200/1584489600

https://backpack.tf/profiles/76561198096290234#!/compare/1584403200/1584489600

sale #6 - bulk

https://backpack.tf/profiles/76561198292825181#!/compare/1579824000/1579910400

https://backpack.tf/profiles/76561198055224435#!/compare/1579824000/1579910400

sale #7 - high

https://backpack.tf/profiles/76561198055224435#!/compare/1580169600/1580256000

https://backpack.tf/profiles/76561198083250013#!/compare/1580083200/1580256000

sale #8 - 24 keys

https://backpack.tf/profiles/76561198083250013#!/compare/1581033600/1581206400

https://backpack.tf/profiles/76561198124728984#!/compare/1581120000/1581206400

sale #9 - untrace

https://backpack.tf/profiles/76561198434480150#!/compare/1583366400/1584144000

https://backpack.tf/profiles/76561198177872379#!/compare/1583625600/1583712000

sale #10 - untrace

https://backpack.tf/profiles/76561198399031554#!/compare/1585267200/1585440000

https://backpack.tf/profiles/76561198177872379#!/compare/1585267200/1585353600

sale #11 - DBD Stahl + Steaming Bonk Helm

https://backpack.tf/profiles/76561198150875713#!/compare/1587168000/1587254400

https://backpack.tf/profiles/76561198859721638#!/compare/1587081600/1587168000

Stahl mini - https://backpack.tf/suggestion/5e9fc349bf3b532dd1485a14

Bonk micro -

https://backpack.tf/profiles/76561197970381831#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561198859721638#!/compare/1585094400/1585180800

9 - 1 = 8

Taking 23.5 + 8 = 31.5, rounded to 32 keys

Sale #12 - bulk

https://backpack.tf/profiles/76561198879412409#!/compare/1587254400/1587340800

https://backpack.tf/profiles/76561198859721638#!/compare/1587254400/1587340800

sale #13 - 40 keys

https://backpack.tf/profiles/76561198879412409#!/compare/1587340800/1587427200

https://backpack.tf/profiles/76561198820339606#!/compare/1587340800/1587427200

Sale #14 - using there

https://backpack.tf/profiles/76561198820339606#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198125791160#!/compare/1587340800/1587427200

---

Taking 32 - 40