Pretty rare.

Solds -

http://www.tf2outpost.com/trade/24453667 - Peace company man ~3.3 buds

Mini: http://www.tf2outpost.com/trade/24537329 - sold for a max (http://backpack.tf/item/76409711)

Sale 2 [DUPED - Invalid]:

http://www.tf2outpost.com/trade/24453667 - Sold for a purple energy pyro's beanie + 3 keys ---> http://backpack.tf/profiles/76561198025291123?time=1420272000 ~2.1 after overpay.

Mini for beanie: http://backpack.tf/vote/id/54b76c09ba8d88107b8b472f - ~2.1 buds

Sale 3:

http://www.tf2outpost.com/trade/24427518 - Sold for a spec ks. australium rocket launcher. He added 21 keys. ~3.5 buds

before - http://backpack.tf/profiles/76561198070849213?time=1420876800

after - http://backpack.tf/profiles/76561198070849213?time=1421049600

Australium Rocket LawnChair:

http://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Australium%20Rocket%20Launcher ----> ONE SOLD FOR 2.25 dollars. WTF?

Average: $179.6 = ~72 keys. = 5 buds.

Done.