This was a bit hard :(

Sale 1

Sold for Specialized Killstreak Australium Axtinguisher 1:1

http://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Australium%20Axtinguisher

Dead Cone : http://backpack.tf/item/722726641

Axtinguisher : http://backpack.tf/item/2205023268

Recent sales :

$29.79

$29.98

$29.38

$26.32

$29.54

$29.99

$23.69

Average is $28.38

28.38 / 2.33 = 12.18 ( Key is $2.33 atm)

12.18 * 0.9 = 10.96

Rounding to 11 keys

Sale 2

Sold for Steaming Larrikin Robin 1:1

http://www.tf2outpost.com/trade/22144228

http://www.tf2outpost.com/trade/22159001

Dead Cone : http://backpack.tf/item/665349415

Larrikin : http://backpack.tf/item/520532072

Larrikin mini :

Sold for bubbling bloke's hat (12.5).It was 1:1

http://www.tf2outpost.com/trade/21689506

http://i.imgur.com/b9nT4tL.png

Bloke's hat : http://i.imgur.com/HQs8OOQ.png Burbujeante = Bubbling

Larriking Robin : http://i.imgur.com/qExF7bX.png Vaporoso = Steaming

12.5 * 0.9 = 11.25 keys

Rounding to 11 keys

Sale 3

Sold for Professional Killstreak Australium Blutsauger 1:1

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Blutsauger

Dead Cone : http://backpack.tf/item/722726641

Blutsauger : http://www.tf2outpost.com/item/440,2992092678,36,11

http://es.tinypic.com/view.php?pic=33jgswg&s=8#.VCW4Gfl5Pis

Blutsauger : http://es.tinypic.com/view.php?pic=6yo39t&s=8#.VCW33fl5Pis

Dead cone : http://es.tinypic.com/view.php?pic=16jpkpx&s=8#.VCW4SPl5Pis

Recent sales :

$35.40

$40.14

$36

$25.02

$36.27

$42.98

$42.90

$37.68

$28.75

$34.71

$35.71

$38

$43.67

$43.60

Average is $37.20

37.20 / 2.33 = 15.96

15.96 * 0.9 = 14.36

Rounding to 14 keys

First unusual suggestion.

Not sure if the 14 keys sale is an outiler,but that's all I could find.

I will really appreciate if you guys find another sale,not sure if I did good or not.

Any type of feed back would be nice.