"Price all the 1st gen Senseis" day, I suppose.

http://www.tf2outpost.com/trade/20322920 - Sold + Duped Haunted Ghosts Noble (3.8 * 0.9 = 3.42 rounded to 3.4) for a Scorching Flames AA (9.75 * 0.9 = 8.775 rounded to 8.8). 5.4 buds.

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Duped Haunted Noble Mini-Suggestion:

http://www.tf2outpost.com/trade/20382289 - Sold for a Scorching Flames Big Elfin' Deal (4.2 * 0.9 = 3.78 rounded to 3.8 buds).

Only sale I could find that has up-to-date prices, and from what I've heard, you don't have to do mini-mini-suggestions.

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No other sales in the past 3 months (aside from one sale that is very easily an outlier). The trader who purchased the hat in the featured listing seems like he's going to keep it, and there's also another hat on the market that hasn't been sold in 4 months, and doesn't have a B/O, so that one might not sell anytime soon.