Bit of a wide range, but took the most representative sales for this.

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The Sales

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http://www.tf2outpost.com/trade/25124129 - Sold for a Screaming Tiger Conga Taunt (21)

21 * 0.9 = 18.9 > 19 Buds.

Proof: http://backpack.tf/profiles/76561198107740754?time=1424505600

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http://www.tf2outpost.com/trade/24956752 - Sold for a Burning Aviator (46)

46 * 0.9 = 41.4 Buds > 41 Buds.

Proof: http://backpack.tf/profiles/76561198086730054?time=1423404841

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(No advertisement available) - Sold for a Roboactive Galvanized Gibus (35.25*) + 2 Buds in Keys.

35.25 * 0.9 = 31.725 > 32 Buds.

Proof: http://backpack.tf/profiles/76561198040930325?time=1423179008

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The Mini Suggestions

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Roboactive Galvanized Gibus (Outdated):

(No Advertisement Available) - Sold for a Duped Burning Flames Stahlhelm. (35.25*)

Taking as 1:1, since there is no available trades on both ends.

Proof: http://backpack.tf/profiles/76561198040930325?time=1425311134

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Duped Burning Flames Stahlhelm:

http://www.tf2outpost.com/trade/24531193 - Sold for a Death at Dusk Dread Hiding Hood (32.5) + 6 Buds Pure.

32.5 * 0.9 = 29.25 + 6 = 35.25.

Proof: http://backpack.tf/profiles/76561198059269644?time=1421710913

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Conclusion: 19 seems to be the outlier. 32 to 41 seems reasonable.