I don't really suggest anymore.

Sale 1: Sold for 40 keys

http://backpack.tf/profiles/76561198137672259/#!/compare/1457938800/1458025200

Sale 2: Sold for Strange Specialized Killstreak Australium Eyelander[39 keys via mini]+1 key

http://backpack.tf/profiles/76561198090669503/#!/compare/1457683200/1457769600

39+1=40 keys

Sale 3: Sold for Green Energy Thirst Blood[45 keys]

http://backpack.tf/profiles/76561198090669503/#!/compare/1456905600/1457510400

Sale 4: Sold for Purple Energy Thirst Blood[42.5 keys via mini]+3 keys

http://backpack.tf/profiles/76561197970466472/#!/compare/1456214400/1456646400

don't understand why they sold it for the same hat+same effect with extra keys...but okay.

42.5+3=45.5 rounding to 46 keys

Mini on Eyelander:

Sellers at 39 keys https://gyazo.com/185b986bf910211e518925d8e578fb9c.png

Mini on PE Thirst Blood: Basically the first 3 sales make a range of 40-45, using 42.5.

I have sales at 40, 40, 45, and 46. Making this a range of 40-46 keys.