Many sales at 7 and lower. This hat's value hasn't held up since its last update. I've included most of the recent sales which range from 5.5-7 buds. I'm taking the 2 pure sales and rounding to 6-7 buds.

http://www.tf2outpost.com/trade/25401424

Sold for a Disco Beat Down Deep Cover Operator (6.45)

http://backpack.tf/profiles/76561198067465104?time=1427180400 (March 24th)

http://backpack.tf/profiles/76561198067465104?time=1427266800 (March 25th)

6.45 * 0.9 = 5.8 buds

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http://www.tf2outpost.com/trade/25204479

Sold with an Elecrostatic Hottie's Hoodie

for 85 keys (7.7 buds with buds as 11 keys)

http://backpack.tf/profiles/76561198053720768?time=1424937600 (February 26th)

http://backpack.tf/profiles/76561198053720768?time=1425196800 (March 1st)

Since this sale also involves another outdated hat it's hard to get a value from this, but it would probably be around 6 buds when subtracting the value for the Hottie's Hoodie.

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http://www.tf2outpost.com/trade/24845656

Sold for an Electrostatic Crone's Dome + 1 bud?

http://backpack.tf/profiles/76561198033165804?time=1422950400 (February 3rd)

http://backpack.tf/profiles/76561198033165804?time=1423123200 (February 5th)

It's a little unclear to me what the exact sale was. The Crone's Dome & 1 bud should be an easy outlier.

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http://www.tf2outpost.com/trade/25074555

Quicksold for 7 buds

http://backpack.tf/profiles/76561198080014630?time=1423728000 (February 12th)

http://backpack.tf/profiles/76561198080014630?time=1423987200 (February 15th)

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http://www.tf2outpost.com/trade/24654571

Sold for a Death at Dusk Heer's Helmet (5.8) + 4 keys (~0.3 buds)

http://backpack.tf/profiles/76561198000323501?time=1421481600 (January 17th)

http://backpack.tf/profiles/76561198000323501?time=1421568000 (January 18th)

(5.8 * 0.9) + 0.3 = 5.5 buds

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http://www.tf2outpost.com/trade/25074794

Quicksold for 6 buds + 1 key + Taunt: Oblooterated

http://backpack.tf/profiles/76561198045680265?time=1424419200 (February 20th)

http://backpack.tf/profiles/76561198045680265?time=1424678400 (February 23rd)

Buyer was looking for quicksells here: http://www.tf2outpost.com/trade/24495406

6.1 buds

Mini Suggestions:

Disco Beat Down Deep Cover Operator: http://backpack.tf/vote/id/55156b08ba8d88c34c8b4601

Death at Dusk Heer's Helmet: http://backpack.tf/vote/id/55156b0eba8d88546a8b47cb