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

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Sold for 23 keys:

http://www.tf2outpost.com/trade/25858886

http://backpack.tf/profiles/76561198072022934?time=1431068400 (May 8th)

http://backpack.tf/profiles/76561198072022934?time=1431154800 (May 9th)

23 keys

Bulk sale for Flaming Lantern Conjurer's Cowl:

http://backpack.tf/profiles/76561198072022934?time=1429340400 (April 18th)

http://backpack.tf/profiles/76561198072022934?time=1430204400 (April 28th)

Sold with 4 keys for Strange Professional Killstreak Kritzkrieg (26):

http://www.tf2outpost.com/trade/25544670

http://backpack.tf/profiles/76561198160927459?time=1427958000 (April 2nd)

http://backpack.tf/profiles/76561198160927459?time=1428044400 (April 3rd)

26 - 4 = 22 keys

Sold for 24 keys:

http://www.tf2outpost.com/trade/25450577

http://www.tf2outpost.com/trade/25434964

http://backpack.tf/profiles/76561198160927459?time=1427007600 (March 22nd)

http://backpack.tf/profiles/76561198160927459?time=1427094000 (March 23rd)

http://backpack.tf/profiles/76561198070483790?time=1427007600 (March 22nd)

http://backpack.tf/profiles/76561198070483790?time=1427439600 (March 27th)

"a dirty mexican" bought a Smoking Tyrant's Helm right after the trade. Some item histories may be weird.

24 keys

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Strange Professional Killstreak Kritzkrieg:

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Kritzkrieg