Not sure if this is low or not

Only Sale

http://www.tf2outpost.com/trade/27325319 Sold for Aussie Amby + KS Aussie Frontier + KS Aussie Minigun + Spec KS Aussie Wrench + 19.8 keys of sweets

X = 16 + 19.8*0.9 + 22.8*0.9 + 9.7*0.9 + 19*0.9

X = 80

Ninja Hood http://backpack.tf/item/3293355009

Australiums and Stuff http://backpack.tf/profiles/76561198131994315?time=1446796800&compare=1447228800

Mini for Wrench

http://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Australium%20Wrench Sold for 60.01, 52.90 and 63.50 on Nov 10th

(60.01 + 52.9 + 63.5)/3 = $58.80

58.8 + 58.8/1.15 = 109.93

109.93/2 = 54.97

Keys were $2.41 at time of sale

54.97/2.41 = 22.8 keys

Mini for Justice

http://steamcommunity.com/market/listings/440/Strange%20Killstreak%20Australium%20Frontier%20Justice Sold for 26 and 24.50 on Nov 17th

(26 + 24.50)/2 = $25.25

25.25 + 25.25/1.15 = 47.21

47.21/2 = 23.61

Keys were $2.43 at time of sale

23.61/2.43 = 9.7 keys

Mini for Mini

http://steamcommunity.com/market/listings/440/Strange%20Killstreak%20Australium%20Minigun Sold for 56.26 on Nov 12th

56.26 + 56.26/1.15 = 105.18

105.18/2 = 52.59

Keys were $2.41 at time of sale

52.59/2.41 = 21.8 keys

However plenty of sellers for 19 for KS Aussie Miniguns, using 19 http://backpack.tf/stats/Strange/Killstreak%20Australium%20Minigun/Tradable/Craftable