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History: https://backpack.tf/item/3342210471
Mannco.Store: https://mannco.store/item/440-searing-plasma-unusual-professionals-panama
April 23: $40/1.82=21.98 ~22 keys
A Marketplace.tf sale happened too but can't trace the history: https://marketplace.tf/items/tf2/109;5;u15
May 4: $54.99/2=27.5 ~28 keys
Taking 22-28 here