Well I think it's a proper time to expand the price range of this Stormy Glengarry Bonnet, since y'know, 6 months old. Any Unusual price/Bud key price will be taken as it was when the sale happened.

Classifieds:

http://backpack.tf/stats/Unusual/Glengarry%20Bonnet/Tradable/Craftable/29 - One at 23 keys (1.3 Buds)

Selling:

http://www.tf2outpost.com/trade/20540078 - Selling for 24 keys (1.4 Buds). Unsold for 2 weeks but was offered a Dead Presidents Dixie (1.3 Buds)

http://www.tf2outpost.com/trade/20975227 - Selling for 22 keys (1.3 Buds). Unsold for less than a day.

http://www.tf2outpost.com/trade/20707297 - Selling for 24 keys (1.4 Buds (though he posts it at 1.5...?)). Unsold for a week.

http://www.tf2outpost.com/trade/20876366 - Selling for 1.5 Buds. Unsold for 4 days (young). (Duped)

http://www.tf2outpost.com/trade/20802183 - Selling for 28 keys (1.6 Buds(wat)). Recieved an offer of an O. Fire Nano + Steaming Gatsby (1.3 Buds)

http://www.tf2outpost.com/trade/20925887 - Taking offers on it. No offers, but was opened 2 days ago. (Duped)

Sold:

http://www.tf2outpost.com/trade/18450772 - Sold for a Planets Private Eye + Craft #136 Belgium Detective + Craft #127 Founding Father + Craft #118 Pirate Bandana (~1.3 Buds)

http://www.tf2outpost.com/trade/20364582 - Sold alongside a SS Salty Dog (1.7 Buds) for a Ghosts Gonzilla + O. Fire Jeepcap (2 Buds + 1 Bud - 1.7 Buds = 1.3 Buds)

http://www.tf2outpost.com/trade/20298220 - Sold for an Australium Black Box (1.2 Buds)

http://www.tf2outpost.com/trade/20232325 - Claims to have sold for 1.4ish in mixed (so 1.3?)

http://gyazo.com/f0d556e91d359f2528cbcef03318f13c - Sold for an Aces Ze Goggles + Black EA + Idea Tube (1.3 Buds)

http://www.tf2outpost.com/trade/20040954 - Sold for a Smoking Tyrantium Helm (Unpriced at the time, but sold for a Smoking Noir which was ~1.1 Buds at the time.) (Proof of purchase; http://gyazo.com/5606a2f9046cf5d46595c97c55e9dc87 )

http://www.tf2outpost.com/trade/20038681 - "Quicksold" for 1 Bud + 3 keys (1.2 Buds since keys were 16 keys)

http://www.tf2outpost.com/trade/20032882 - Sold for a DBD Bot Dogger (unpriced at the time so invalid)

http://www.tf2outpost.com/trade/20614519 - Sold for an O. Fire Bicorne (1.5 Buds.)

http://www.tf2outpost.com/trade/20354940 - Sold for 18 keys (1.1 Buds)

http://www.tf2outpost.com/trade/20108229 - Sold for a SS Ye Oiled Baker Boy (17 keys) + x amount of keys

http://www.tf2outpost.com/trade/20103284 - Apparently sold for 20 keys (1.3 Buds)

http://www.tf2outpost.com/trade/19537376 - Sold along with an all Strange set of a Spec. Eyelander (2 keys) + Loch (1.5 keys), Dark Age Defender (1.1 keys) and a Strange Splendid Screen (1.8 keys) (.4 Buds) along with a Smoking Ol Geezer (.7 Buds) for a DP Scotsman Stove Pipe (2.6 Buds) (2.6 - 1.1 = 1.5.)

http://www.tf2outpost.com/trade/18322719 - Sold for a DBD Bombing Run (1.2 Buds)

http://www.tf2outpost.com/trade/20785546 - Sold for a Steaming Stahl (1.2 Buds)

http://www.tf2outpost.com/trade/20349448 - Took "around" 1 Bud pure. Outlier.

http://www.tf2outpost.com/trade/20095854 - Sold along with a S. Grenade Launcher + S. Stickybomb Launcher for a G. Fetti Texas Ten Gallon (1.3 Buds)

http://www.tf2outpost.com/trade/20083500 - Sold for a Blizz Private Eye (1.3 Buds)

http://www.tf2outpost.com/trade/19494078 - Sold for a G. Fetti Brigade Helm (1.4 Buds)

http://www.tf2outpost.com/trade/19409883 - Sold for a Smoking Voodoo Juju (1.5 Buds.)

http://www.tf2outpost.com/trade/19362566 - Sold for a Smoking Dragonborn Helm (1.5 Buds)

http://www.tf2outpost.com/trade/18395614 - Sold along with a Steaming Engi Cap (12 keys) for a TF Logo Defiant Spartan (1.6 Buds) (1.6 - .6 = 1 Bud. Outlier)

Conclusion: Many sales around the 1.1-1.5 Bud range, so I'll put that as the new range. Proof and counterproof are always welcome, and thanks for considering.

Side note: I was listening to https://www.youtube.com/watch?v=dXSDLQMQjTM while doing this suggestion since I really like this song (though it's kinda depressing if you know the backstory of when this song plays).