2 month old price, thanks to Puddington for two of the sales and pointing out this was sorely outdated in the first place. Most of these are owned by either Hearts or Cloud 9 collectors right now so sales are going to be getting increasingly sparse as time goes on and more collectors get taunts.

Offered on (and sold for) a Sunbeams Thirst Blood Thirst Blood (~7.7 see http://backpack.tf/vote/id/54f417baba8d88905b8b4a25 )

http://www.tf2outpost.com/trade/24989672 - B/O was 7 buds, calling this a low outlier... just like in the Thirst suggestion

Sold for Green Energy Rifleman (~5.8), Kill-a-Watt War Pig (~3), Strange Killstreak Aussie Ambassador (~1.3) and Strange Festive Knife (~1) = ~11 buds but B/O of 10 buds

http://www.tf2outpost.com/trade/24963480

Sold for 7 buds + 6 keys (~0.5) + S.F. Knife (~1) = 8.5 buds

http://backpack.tf/profiles/76561197970709145?time=1422604800 (Before)

http://backpack.tf/profiles/76561197970709145?time=1422864000 (After)

This one might require a bit of explanation since the history doesn't match up. All the buds, keys, and knives present for the sale came from the same person who also happened to buy a 45 bud unusual from the taunt's next owner so my guess was that this was a down payment for a later larger transaction that took place about two weeks later since the taunt was the only unusual or item of obvious value to leave their backpack.

http://backpack.tf/item/1198029707 (also outdated so perhaps someone more adventurous can update this as well)

Sold for Death and Dusk Bonk Leadwear (~unpriced) + Duped Knifestorm Vintage Tyrolean (~9, 2 years outdated) + Holy Grail Spent Weill Spirite (~2.7) + Screaming Tiger Results Are In (~2.1, 6 months outdated) = an obvious outlier. The Tyrolean alone would have been a reasonable sale to expect but the Bonk and taunts, outdated and unpriced as they are, just push this right off the edge.

http://www.tf2outpost.com/trade/24989264

http://backpack.tf/profiles/76561198048292656?time=1423728000