DON'T GO IN THERE! (Credit to shufflespy helping me out price the tank top!)

https://marketplace.tf/items/tf2/31010;5;u116

Sale 1: Sold for $155.55

Key Price: $1.81

155.55 / 1.81 = 85.93. Rounded to 86 keys.

https://marketplace.tf/items/tf2/31010;5;u116

Sale 2: Sold for $61.65

Key Price: $1.83

61.65 / 1.83 = 33.68. Rounded to 34 keys.

https://marketplace.tf/items/tf2/31010;5;u116

Sale 3: Sold for $90

Key Price: $1.83

90 / 1.83 = 49.18. Rounded to 49 keys.

https://marketplace.tf/items/tf2/31010;5;u116

Sale 4: Sold for $75

Key Price: $1.82

75 / 1.82 = 41.2. Rounded to 41 keys.

https://backpack.tf/item/7753333817

Sale 5: Sold for a Burning Flames Bombing Run (27-32 keys ; Middle Price: 29.5)

https://backpack.tf/profiles/76561198803824764#!/compare/1560556800/1560643200

https://backpack.tf/profiles/76561198256438505#!/compare/1560470400/1560643200

( Mini-Price Suggestion for Burning Flames Bombing Run

https://backpack.tf/item/4013839880

Sale 1: 31 keys + 26 ref. Rounded to 32 keys.

https://backpack.tf/profiles/76561198160392381#!/compare/1560038400/1560211200

https://backpack.tf/profiles/76561198267189538#!/compare/1560038400/1560211200

https://backpack.tf/item/4013839880

Sale 2: 27 keys

https://backpack.tf/profiles/76561198309612194#!/compare/1561939200/1562025600

https://backpack.tf/profiles/76561198006544512#!/compare/1561852800/1562025600

https://backpack.tf/item/4013839880

Sale 3: 32 keys + 25 ref. Rounded to 33 keys.

https://backpack.tf/profiles/76561198006544512#!/compare/1562457600/1562544000

https://backpack.tf/profiles/76561198305494036#!/compare/1562457600/1562544000

https://backpack.tf/item/4013839880

Sale: ? (Possibly 30 keys, but not certain so won't count this one)

https://backpack.tf/profiles/76561198267189538#!/compare/1561766400/1561852800

https://backpack.tf/profiles/76561198309612194#!/compare/1561766400/1561852800

https://backpack.tf/item/2995464194

Sale: ?

https://backpack.tf/profiles/76561198445022438#!/compare/1563840000/1563926400

https://backpack.tf/item/2995464194

Sale: ?

https://backpack.tf/profiles/76561198337734785#!/compare/1563408000/1563494400

https://backpack.tf/item/2995464194

Sale: ?

https://backpack.tf/profiles/76561198090956917#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198337734785#!/compare/1563321600/1563408000

Plenty more sales, but I'll be here for 2 days trying to get more. Let's continue)

Back to our regular scheduled program.

https://backpack.tf/item/7370322894

Sale 6: Bulk Sale

https://backpack.tf/profiles/76561198061275415#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198303138234#!/compare/1566000000/1566086400

https://backpack.tf/item/7259109048

Sale 7: Sold for a Eldritch Opening Tank Top + 5 keys (33-36 keys ; Middle is 34.5 , new suggestion)

https://backpack.tf/profiles/76561197980830714#!/compare/1560988800/1561075200

https://backpack.tf/profiles/76561198136220673#!/compare/1560643200/1561075200

https://backpack.tf/item/7252385523

Sale 8: Sold for a Nebula A Head Full of Hot Air - 18 keys (Priced at 56 keys, last updated 2 months, still valid.)

https://backpack.tf/profiles/76561198868564267#!/compare/1563580800/1563667200

https://backpack.tf/profiles/76561198127938353#!/compare/1563408000/1563667200

Sale 9: Sold for a Burning Flames Rimmed Raincatcher (32-55 keys ; Middle is 43.5 keys)

https://backpack.tf/profiles/76561198127938353#!/compare/1565913600/1566086400

https://backpack.tf/profiles/76561198143843183#!/compare/1565308800/1566086400

( Mini-Price Suggest for Burning Flames Rimmed Raincatcher

https://marketplace.tf/items/tf2/216;5;u13

Sale 1: Sold for $60

Key Price: $1.85

60 / 1.85 = 32.43. Rounded to 32 keys.

https://marketplace.tf/items/tf2/216;5;u13

Sale 2: Sold for $60.15

Key Price: $1.82

60.15 / 1.82 = 33.04. Rounded to 33 keys.

https://marketplace.tf/items/tf2/216;5;u13

Sale 3: Sold for $100

Key Price: $1.82

100 / 1.82 = 54.94. Rounded to 55 keys.

https://backpack.tf/item/6574538157

Sale 4: Sold for 46 keys

https://backpack.tf/profiles/76561198296839425#!/compare/1560470400/1560556800

https://backpack.tf/profiles/76561198156274478#!/compare/1560470400/1560556800

More sales, but that's all we need.)

Back to our regular scheduled program.

https://backpack.tf/item/7259109048

Sale: A Unusual Wrench + 11 keys (Have no clue what the wrench price is nor are there any sales or history, won't count this one)

https://backpack.tf/profiles/76561198136220673#!/compare/1561075200/1561161600

https://backpack.tf/profiles/76561198048046849#!/compare/1561075200/1561161600

https://backpack.tf/item/7259109048

Sale: ?

https://backpack.tf/profiles/76561198048046849#!/compare/1562025600/1562198400

https://backpack.tf/profiles/76561198054601655#!/compare/1562112000/1562284800

https://backpack.tf/item/7276009867

Sale: ?

https://backpack.tf/profiles/76561198079363927#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198033085440#!/compare/1566000000/1566345600

https://backpack.tf/item/7370322894

Sale: ?

https://backpack.tf/profiles/76561198215020869#!/compare/1564876800/1565827200

https://backpack.tf/profiles/76561198061275415#!/compare/1564704000/1564963200

https://backpack.tf/item/7774473975

Sale: ?

https://backpack.tf/profiles/76561198080179568#!/compare/1562544000/1562630400

https://backpack.tf/profiles/76561198127314754#!/compare/1562457600/1562630400

https://backpack.tf/item/7250716690

Sale: ?

https://backpack.tf/profiles/76561198079991585#!/compare/1562889600/1563926400

So after all this, we have our price range. 86 is a outlier, so see ya! 49 is also a outlier, considering all of the sales are low 40's or below. 30 is cut off as it is too close to buyers, and 44 is removed because there has been a 2+ month seller at 40, so anything above it is removed besides 41.

FINAL PRICE RANGE: 34-41