My 100th suggestion, hopefully it gets accepted ;)

2 of these in existence, 1 on outpost, the most relevent sales to the range have been highlighted in bold.

http://www.tf2outpost.com/trade/12718518

-offered Peace Bonk Helm(~1.2)

Sold for O. Fire Jeepcap(~1.3 buds)

http://www.tf2outpost.com/trade/12641440

Sold for Miami Nights Mountain Cap(~3.4) - outlier

Proof: http://backpack.tf/id/76561198073612227?time=1373785200 -> http://backpack.tf/id/76561198073612227?time=1373958000

http://www.tf2outpost.com/trade/12182963 - B/O 2 buds

Sold for Ghosts Gatsby(~1.5, outdated)

http://www.tf2outpost.com/trade/12176293 - B/O 1 bud + 13 keys = 1.6 buds

Possibly sold for...a copy of Deadpool? Don't even know what to value this at, though it's $40 on steam

http://www.tf2outpost.com/trade/11757594

Sold for V. Bills(~1.6 buds)

http://www.tf2outpost.com/trade/13232823 - current owner, B/O 1.8 buds