This thing has a weird history of people selling it for less then their C/Os.

http://www.tf2outpost.com/trade/14122487 Offer of 1 bud and 1 key, but for some reason the owner seems to have sold it to another person for a single bud. See http://backpack.tf/id/76561197990421343?time=1378623600 then http://backpack.tf/id/76561197990421343?time=1378796400 .

http://www.tf2outpost.com/trade/14082764 Offer of a blizz softcap (~1.2) However, his backpack on the day he sold it seems to suggest he sold it for merely a bud, http://backpack.tf/id/76561198029126276?time=1378105200

Both sales are only a bud apiece, but they went quick for an unusual and there seems to be some demand at higher prices, with 1.05 and 1.2 offers.

Note: I suggested 1-1.2 buds, but crackpack.tf changed the currency automatically, so sorry that my proof is in buds but my suggestion is in keys.