A lot of these are apparently duped - I've tried to stick to ones that aren't duped for this (used only the ones in the previous suggestion for this)

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http://www.tf2outpost.com/trade/20947404 - Sold for Miami Nights Flipped Trilby (3.7 * 0.9 = ~3.3 buds)

http://www.tf2outpost.com/trade/19521903 - Sold for Bubbling Stomin' Norman (17 * 0.9 = ~15 keys) + Bubbling Tossle Cap (1.8 * 0.9 = ~1.6 buds) (15 / 18 + 1.6 = ~2.4 buds)

Mini-suggestion for the Norman below.

Mini-suggestion for Bubbling Norman:

http://www.tf2outpost.com/trade/19547456 - Sold for Terror-Watt Pure Tin Capotain (1.4 * 0.9 = ~1.3 buds) outlier?

http://www.tf2outpost.com/trade/20902174 - Sold for Kill-A-Watt Dread Knot (~15 keys, outdated)

http://www.tf2outpost.com/trade/21101288 - Sold for 17 keys pure (went rather quick)

http://www.tf2outpost.com/trade/20969643 - Looking for ~20 keys

http://www.tf2outpost.com/trade/21118293 - Looking for offers

1.3 is rather high and is an older sale so I'm disregarding it - taking 17 keys as the value here.

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http://www.tf2outpost.com/trade/19407226 - Sold with Cloudy Moon Tyrant's and Time Warp Metal Slug for Cloudy Moon Modest Pile of Hat

Ugh... The maths with this one.

Tyrant's = ~12.8 buds (outdated)

Slug = ~5.4 buds (outdated)

Modest = ~16.2 buds (outdated)

I'm not even going to try this one, bleh.

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http://www.tf2outpost.com/trade/21023081 - B/O of 4.5

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There have been better ranges. :s I did attempt the mini for all three hats, but c'mon, I only do low / mid tier stuff. Anyone else wanna try that last sale I had? Go for it.