8 month outdated price.

#1:

http://www.tf2outpost.com/trade/8934560

3 buds or more by Ziddia // じぢあ (2 weeks ago) (tentative)

Offered 3 buds (2 pure, 3rd in items) by Yu-Gi-Oh (4 days ago)

Side Note: Owner told Ziddia that he'd accept 3 buds + a little sweets, but Ziddia's was originally 4 Coupes (Steaming, Smoking, Searing, Nuts) that he's currently trying to convert into pure which I doubt will happen.

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#2:

http://www.tf2outpost.com/trade/8383363

4 buds pure by Rock Steady (1 month ago)

Side Note: He was collecting and possibly added the owner to bargain once he got close to the amount he said he would get. Might not have actually sold for 4 buds pure as he had originally offered.

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Interesting part:

The hat might have been scammed from Rock Steady by Котик97: http://www.tf2outpost.com/trade/8807665 that was the last trade he made before he got marked as a scammer.

It then shows up in the hands of Beria who sets the buyout to 3 buds: http://www.tf2outpost.com/trade/8812533

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#3:

http://www.tf2outpost.com/trade/8838283

3 buds pure by Sleeping sUn (1 month ago) (Owner added to discuss || fell through)

3 buds + keys by The Boweldictorian (1 month ago) (bought it || amount of keys unknown)

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#4:

http://www.tf2outpost.com/trade/8931013

The Boweldictorian set a buyout of 3.3 buds here.

http://www.tf2outpost.com/trade/9006060

The Boweldictorian gets impulsive and sets a buyout of 2.6 buds because...yolo?

It then ends up in the hands of a scammer again: http://www.tf2outpost.com/user/130849

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#5:

http://www.tf2outpost.com/trade/9156993

camou ends up with it and sets a buyout of 3.5 buds. Receives an offer of 3 buds pure from .Muku -SuP- (3 weeks ago). Not clear what it ended up selling for in the end.

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Conclusion: sales/offers over the past month seem to occur around 3 buds and a little more. There was a supposed sale at 4 buds, but sadly seemed the unusual was scammed. There was also a quicksale at 2.6 buds which landed it in the hands of another scammer, but with those two circumstances being the extremes, I believe that 3-3.3 buds is a good bump price for this unusual.