Counter-suggestion.

5 month old price.

Sale #1: http://www.tf2outpost.com/trade/22636165 -- TF Logo Tough Stuff Muffs + Team Spirit Essential Accessories + Mann Co. Orange Bruiser's Bandanna + 1 key for Misty Skull Attendant + 1 Earbud (http://backpack.tf/profiles/76561198072395978?time=1413183600 -> http://backpack.tf/profiles/76561198072395978?time=1413270000) -- [~6 with overpay]

Sale #2: http://backpack.tf/profiles/76561198061508957?time=1413356400 -> http://backpack.tf/profiles/76561198061508957?time=1413442800 - Aces High Antlers [5.2 after overpay]

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Supporting proof:

http://www.tf2outpost.com/trade/22635576 - B/O of 6 for almost a month (Old trade: http://www.tf2outpost.com/trade/22230793) Sold for: http://www.tf2outpost.com/trade/22636442 Kill-A-Watt Hustler's Hallmark + duped Green Energy Bombing Run (~<=4.2 using outdated clean Bombing Run price, outlier)

http://www.tf2outpost.com/item/440,3063500700,213,5 -> http://www.tf2outpost.com/item/440,3068291856,30003,5 - Orbiting Planets Galvanized Gibus (unpriced, no usable sales I could find for a minisuggestion, current B/O of 7.5 [http://www.tf2outpost.com/trade/23177829], previous owner had B/Os as low as 6 [http://www.tf2outpost.com/trade/23143043])

http://www.tf2outpost.com/trade/20557309 - I owned one for over 2 months with a B/O of 6 buds the entire time before I finally sold it on September 3rd for a duped Anti-Freeze Hottie's Hoodie + 10 keys (http://i.imgur.com/dcWDq90.png)

Clean Misty Skull Attendant for sale in classifieds for 6 buds: http://backpack.tf/classifieds/?tradable=1&craftable=1&item=Attendant&quality=5&particle=44 http://i.imgur.com/hCja8V2.png Screenshot if it's removed/sells.

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From the other suggestion, the Burning Tower sale is inaccurately valued due to a duped Burning Scotch Bonnet (http://backpack.tf/item/513812999) being added. That Attendant is duped, so I'm not using that sale to price it here. I'm calling the other 2 sales provided at 8.3 and 7.8 buds outliers based on the above proof.