Sale 1: 3.5

I got mine for: http://i.imgur.com/AAZn1rr.png

34 keys

spec. australium knife

14 description tags

7 name tags

Macho Mann

unique crocleather slouch

(2 + (1.4+0.3)*0.9 ) = 3.5

killstreak etc. doesn't matter so much as this one is right in the middle of my other two sales :)

Sale 2: 3.8

http://www.tf2outpost.com/trade/21880188

Burning raincatcher -> SBTWC slouch + steaming HWNN

raincatcher - 5.4

HWNN (outdated) - 1.2*

(5.4 - 1.2)*0.9 = 3.8

Sale 3: 3.3

http://backpack.tf/profiles/76561198059356412?time=1410159600

http://backpack.tf/profiles/76561198059356412?time=1410246000

GE hound dog + 19 keys

2.4*0.9 + 19/17 = 3.3

*mini - http://www.tf2outpost.com/trade/22558074 - gold bills + 14 keys offered (and accepted?) = 20 keys.