Unpriced. I honestly thought I'd be putting out a 3 bud suggestion, not this.

USABLE SALES:

Sold for 2 buds + 9 keys + Pro Australium Force a Nature (~1.6 see mini below) + ~1.5 in sweets = ~4.2, buds at 15 keys

http://www.tf2outpost.com/trade/24599804

http://backpack.tf/profiles/76561198105071091?time=1421222400

Consistent sales for Pro FaN of ~$63CAD = ~1.8 buds, SCM bud price at ~$35 CAD

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Force-A-Nature

Sold for Green Energy Tippler's Tricorne(~2.8) + Miami Nights Your Worst Nightmare (~2.3) = ~5.1 buds

http://www.tf2outpost.com/trade/24682487

http://backpack.tf/profiles/76561198156092540?time=1422086400

Sold alongside a Green Black hole Rimmed Raincatcher (~2.5, 9 month old price) for a Burning Hermes (~7.5) = ~5 buds for the Taunt

http://www.tf2outpost.com/trade/24497085

http://backpack.tf/profiles/76561198034183306?time=1421481600

Raincatcher mini:

Sold in a day for 2 buds + 4 keys as per B/O, quicksells for just under current outdated price so just going to stick with that

http://www.tf2outpost.com/trade/24877086

http://backpack.tf/profiles/76561198034183306?time=1422604800 (Between the scout soul and the OMA)

UNUSABLE SALES:

Sold alongside a Vivid Plasma Mining Light (~4) + 1 bud + 18 keys + ~3 keys in sweets for a duped Secret to Everybody Salty Dog (~8.7, year old price), not touching between the duping and complexity of sale. Considering that 8 bud B/O though, the taunt price would be less than 2 buds anwyays.

http://www.tf2outpost.com/trade/24757800

http://backpack.tf/profiles/76561198075197384?time=1422259200

Bought mine for a Blizzardy Storm Nano (~1 bud, 3 month old price) + Planets Das Maddendoktor (~1.1 bud, 7 month old price) + 7 keys

http://www.tf2outpost.com/trade/24398125

http://i.imgur.com/pfNiKHX.png (Posting this mostly for proof of the keys)

http://www.tf2outpost.com/trade/24488324 (Posting this as proof of effect)

No mini is possible for the Maddendoktor since I unboxed that one and no others have sold since the last suggestion passed. Likely an outlier though given the two 5 bud sales above.

Can't trace sale

http://www.tf2outpost.com/trade/24877265

http://backpack.tf/profiles/76561198034183306?time=1422777600

Sellers:

http://www.tf2outpost.com/trade/25050131 - no price, 1 week, rejected 3 buds

http://www.tf2outpost.com/trade/25137721 - 4 buds, young