Sold with 20 keys + 9 ref (~21.5 keys) for a memory leak noble (3) ~ 1.85 buds:

http://www.tf2outpost.com/trade/16021092

http://backpack.tf/id/76561198047254915?time=1385884800 - after

http://backpack.tf/id/76561198047254915?time=1385712000 - before

Sold for a power surge whoopee (3.3):

http://www.tf2outpost.com/trade/15863481

Sold + 15 keys for a Chiroptera Venenata tyrannus (6.3):

http://www.tf2outpost.com/trade/16002610

Sold for a Harvest moon western wear (4):

http://www.tf2outpost.com/trade/15450188 (JCapps (NF526) is the broker)

Sold for a Kill a watt tyrannus (no price):

http://www.tf2outpost.com/trade/16044659

1.85 buds and 6.3 buds sales are outliers. 3.3-4 buds seems like a fair price. Placing it among the other high tier SnS.