2 year old price, never had a proper suggestion.

http://www.tf2outpost.com/trade/19448078

-b/o 1.5

Sales

http://www.tf2outpost.com/trade/18927943 --> http://www.tf2outpost.com/trade/19039398

-Sold for Pro. Aussie Tomislav. (~1 bud, pro kit sells for ~5 keys in scm)

http://www.tf2outpost.com/trade/18883113 --> http://www.tf2outpost.com/item/440,2477374808,152,5

-Sold for Bubbling Kabuto + 1 key (key found here: http://www.tf2outpost.com/trade/18965978 ) so 1.2 x .9 ~1.1

-Bubbling Kabuto has been sold for steaming letch LED (~.9) + sweets worth .3+ (his b/o is 1.2 http://www.tf2outpost.com/trade/18908228 )

http://www.tf2outpost.com/trade/18881911 --> http://www.tf2outpost.com/item/440,2460869964,30116,5

-Sold for Nuts Carribean (~1.4)

http://www.tf2outpost.com/trade/19110171 --> http://www.tf2outpost.com/item/440,2542591641,252,5

-Sold for steaming dappers (~1)

http://www.tf2outpost.com/trade/18656204 - sold for smoking dragonborn + 1 key so like ~1.2)

http://www.tf2outpost.com/trade/19282383 (1.2 b/o for smoking dragonborn)

http://www.tf2outpost.com/trade/18579555

-b/o 1.3

Feel free to counter / support my proof. Vote based on proof presented, not blindly!