The low end of this hat's price was only 2 buds before the currency conversion.

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Sold with ~4 keys for Kill-a-Watt Whoopee Cap:

http://backpack.tf/profiles/76561198086948995?time=1428994800 (April 14th)

http://backpack.tf/profiles/76561198086948995?time=1429081200 (April 15th)

http://backpack.tf/profiles/76561198086948995?time=1428994800 (April 14th)

http://backpack.tf/profiles/76561198086948995?time=1429081200 (April 15th)

25 - 4 = 21 keys

Presumably offered.

Sold for 42 keys:

http://backpack.tf/profiles/76561198148528762?time=1429340400 (April 18th)

http://backpack.tf/profiles/76561198148528762?time=1429513200 (April 20th)

Outlier; seller at 32 keys.

http://www.tf2outpost.com/trade/25943516

Sold for 15 keys:

http://backpack.tf/profiles/76561198148528762?time=1428217200 (April 5th)

http://backpack.tf/profiles/76561198148528762?time=1428390000 (April 7th)

Seems like a quicksell.

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Kill-a-Watt Whoopee Cap:

Taking 25 keys