Current Seller

9 keys Buyout. 2 weeks.

http://www.tf2outpost.com/trade/27371027

Sale 1

http://backpack.tf/profiles/76561198042262268?time=1442818800&compare=1442905200

10 Keys

Sale 2

http://backpack.tf/profiles/76561198203310428?time=1446274800&compare=1446361200

http://backpack.tf/profiles/76561197991197450?time=1445583600&compare=1446361200

Mini for the Tam

http://backpack.tf/profiles/76561198119183871?time=1447747200&compare=1447833600

http://backpack.tf/profiles/76561198074243786?time=1447747200&compare=1447833600

25 keys in sweets

34-25 equals 9 keys for the Tam

Calculation for the Sack

6 keys in sweets

9-6

3 keys What? I guess this is a huge outlier or it was sold in the steam market instead.

Sale 3

http://backpack.tf/profiles/76561198105016539?time=1444460400&compare=1444374000

Sack is duped

Orb. Fire Botdogger for Duped Orb. Planets Doctor Sack and strange disc. Action [2 keys]

Mini for the Botdogger

http://backpack.tf/profiles/76561198121571096?time=1444287600&compare=1444374000

Sold with 1 key pure and 3 Duty Tickets for Spec. Ks Earbuds [11.5 keys]

11.5 keys is the lowest price right now.

11.5/1.15 equals 10 keys

http://steamcommunity.com/market/listings/440/Specialized%20Killstreak%20Earbuds

Credit to MaGenta for this calculation

3*7 equals 21. 21/18 equals 1.16 keys

10 - 2.16 = 7.84 (rounding to 8)

9 Keys for the Bot dogger

9-2 equals 7

7 keys

Taking 9 to 10 because of the buyers at 8 and im not taking 7 into the range since i dont have proof to lower the price to 8 either.

Thanks to Jarool, mike and rectangle