Resuggest: https://backpack.tf/suggestion/5e98aefc47bae83fb209b0dc

Sale 1:

https://marketplace.tf/items/tf2/380;5;u57

$69 / $1.68 = 41.07 keys // https://backpack.tf/item/4813853823

Sale 2:

untrace

https://backpack.tf/profiles/76561198054448372#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198333986358#!/compare/1584662400/1584748800

Sale 3:

29 pure

https://backpack.tf/profiles/76561198333986358#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198271936634#!/compare/1585526400/1585612800

Sale 4:

26 pure

https://backpack.tf/profiles/76561198262570352#!/compare/1579478400/1579564800

https://backpack.tf/profiles/76561198318065526#!/compare/1579564800/1579651200

Sale 5:

42 pure

https://backpack.tf/profiles/76561198318065526#!/compare/1582675200/1582761600

https://backpack.tf/profiles/76561198072465460#!/compare/1582761600/1583020800

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Blaze:

new sale on marketplace at $69.99 = 40 keys

https://bot.tf/stats/listings/YDL2QXZK

https://backpack.tf/profiles/76561198850274253#!/compare/1583452800/1583539200 - sold a few things for 65 keys with the luchadore valued at 32 keys as indicated from the b/o (it was up at this price for a while as well)

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new sale at $79.99 https://marketplace.tf/items/tf2/380;5;u57

79.99/1.9=42.1

cant see which history

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Blaze:

with sales at 26, 29, 32, 40, 41, 42, 42, i would probably go with 32-42 here to take the lower sales into account. the 32 key sale was up for a while as well

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buyers at 29: https://imgur.com/a/1b3BXP8