https://backpack.tf/item/4765473452

https://backpack.tf/item/8696053843

https://backpack.tf/item/7957105497

https://marketplace.tf/items/tf2/94;5;u61

$79.99 / $1.89 = 42.32 keys

$79.99 / $1.88 = 42.55 keys

No buyouts found

supporting evidence:

the last 3 sales on this item, from march to april 2020, were also for $79.99

https://gyazo.com/bae22ddc6a9b06591530b35e4f120654

//

https://backpack.tf/profiles/76561198441915077#!/compare/1588896000/1589587200

https://backpack.tf/profiles/76561198091502579#!/compare/1588809600/1588982400

Untraceable

//

https://backpack.tf/profiles/76561198091502579#!/compare/1589673600/1589760000

https://backpack.tf/profiles/76561197970812030#!/compare/1589760000/1590624000

This is a Marketplace sale

//

Currently another seller at $79.99, which with right now key price is 41 keys

https://gyazo.com/295e0254c1529078de9c0ff5c1e6734c

Going with 41-43 keys for the time being.

The $79.99 seller actually sold

https://marketplace.tf/items/tf2/94;5;u61

$79.99 / $1.92 = 41.66 keys

dang it, so close with the low end.