Update!

Sale 1: https://backpack.tf/profiles/76561197984373540#!/compare/1586908800/1586995200

https://backpack.tf/profiles/76561198062153114#!/compare/1586995200/1587081600

?

Sale 2: https://backpack.tf/profiles/76561198062153114#!/compare/1587168000/1587340800

https://backpack.tf/profiles/76561198118157202#!/compare/1587254400/1587340800

Bulk.

Sale 3: https://backpack.tf/profiles/76561198118157202#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198841365001#!/compare/1587427200/1587513600

Bulk.

Sale 4: https://backpack.tf/profiles/76561198270949034#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198097119648#!/compare/1588550400/1588636800

?

Sale 5: https://backpack.tf/profiles/76561198097119648#!/compare/1588636800/1588723200

https://backpack.tf/profiles/76561198100484031#!/compare/1588291200/1588723200

?

Sale 6: https://backpack.tf/profiles/76561198100484031#!/compare/1588723200/1588896000

https://backpack.tf/profiles/76561198022589417#!/compare/1588636800/1588723200

?

Sale 7: https://backpack.tf/profiles/76561198022589417#!/compare/1589068800/1589155200

https://backpack.tf/profiles/76561198269337198#!/compare/1589068800/1589155200

?

Sale 8: https://backpack.tf/profiles/76561198269337198#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198273988414#!/compare/1589068800/1589241600

?

Sale 9: https://backpack.tf/profiles/76561198273988414#!/compare/1589414400/1589500800

https://backpack.tf/profiles/76561198143506803#!/compare/1588636800/1589414400

?

Sale 10: https://backpack.tf/profiles/76561198143506803#!/compare/1588636800/1589414400

https://backpack.tf/profiles/76561198158238131#!/compare/1589414400/1589500800

?

Sale 11: https://backpack.tf/profiles/76561198363395191#!/compare/1589500800/1589587200

https://backpack.tf/profiles/76561198118157202#!/compare/1589500800/1589587200

?

Sale 12: https://backpack.tf/profiles/76561198118157202#!/compare/1590019200/1590105600

https://backpack.tf/profiles/76561198841365001#!/compare/1590019200/1590105600'

?

Sale 13: https://backpack.tf/profiles/76561198841365001#!/compare/1590105600/1590192000

https://backpack.tf/profiles/76561198078018027#!/compare/1590105600/1590192000

?

Sale 14: https://backpack.tf/profiles/76561198078018027#!/compare/1590451200/1590537600

https://backpack.tf/profiles/76561198432461884#!/compare/1590278400/1590451200

?

Sale 15: https://backpack.tf/profiles/76561198432461884#!/compare/1590537600/1590624000

https://backpack.tf/profiles/76561198089253101#!/compare/1590537600/1590624000

?

Sale 16: https://backpack.tf/profiles/76561198089253101#!/compare/1590537600/1590624000

https://backpack.tf/profiles/76561198012537041#!/compare/1590537600/1590624000

?

Sale 17: https://backpack.tf/profiles/76561198012537041#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198160080788#!/compare/1590883200/1590969600

?

Sale 18: https://backpack.tf/profiles/76561198160080788#!/compare/1592179200/1592265600

https://backpack.tf/profiles/76561198030214998#!/compare/1592179200/1592265600

?

Sale 19: https://backpack.tf/profiles/76561198030214998#!/compare/1592265600/1592352000

https://backpack.tf/profiles/76561198089253101#!/compare/1592265600/1592352000

?

Sale 20: https://backpack.tf/profiles/76561198273681900#!/compare/1586995200/1587254400

https://backpack.tf/profiles/76561198049344583#!/compare/1587168000/1587340800

64 pure + lil adds

Sale 21: https://backpack.tf/profiles/76561198049344583#!/compare/1588204800/1588291200

https://backpack.tf/profiles/76561198288951592#!/compare/1588204800/1593129600

100 pure.

Sale 22: https://marketplace.tf/items/tf2/920;5;u15 - 135/1.81 = ~75

https://backpack.tf/item/8277015182

Sale 23: https://marketplace.tf/items/tf2/920;5;u15 - 178/1.82 = ~98

https://backpack.tf/item/7682105274

Rest of the mp.tf sales: https://marketplace.tf/items/tf2/920;5;u15

149.95/1.89 = ~79

147.78/1.92 = ~77

Sales: 64, 100, 75, 98, 79 and 77. Classies: https://i.imgur.com/TgD3bz8.png. Going with 75-100.