3 month old price. Started this to help the other suggestion, but then it became too much work so I'm making this myself.

http://www.tf2outpost.com/trade/22346217 - 1 day ago (credit born_again)

Sold for a bud + 20 keys = 2.1 buds

http://www.tf2outpost.com/item/440,2923028034,137,5 - 1 week ago

gig to slide

Sold for a hearts larkin = 1.9 buds

http://backpack.tf/profiles/76561198070001821?time=1409209200 -> http://backpack.tf/profiles/76561198070001821?time=1409382000

http://www.tf2outpost.com/trade/22226666 - 1 week ago

Sold for a planets Brown Bomber and seller added 4 keys = 2 buds

http://www.tf2outpost.com/trade/21889389 - 3 weeks ago (credit Apothic)

Sold for 27 keys + 3 in items = 1.6 buds

http://www.tf2outpost.com/item/440,2879939336,137,5 - 2 months ago

bf3 to noh

Sold for Steaming Noble + .5 buds in keys/metal = 2 buds

http://backpack.tf/profiles/76561198112959385?time=1404630000 -> http://backpack.tf/profiles/76561198112959385?time=1404716400

seller after: http://backpack.tf/profiles/76561198086770346?time=1404716400

The 1.6 only took a couple days to sell and with 4 other sales at ~2 buds I'm calling the 1.6 a quasi-quicksell.