The low end of this hat's price was only 8.5 buds before the currency conversion.

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Sold for 5 buds (10):

http://backpack.tf/profiles/76561198028269888?time=1427439600 (March 27th)

http://backpack.tf/profiles/76561198028269888?time=1427612400 (March 29th)

5 * 10 = 50 keys

Sold for 50 keys:

http://i.gyazo.com/5e40e7720b4a1de63cd84e0cc668c151.png

50 keys

Sold for 7 buds (8):

http://i.gyazo.com/e73628786b972c5e28b13bb37040a450.png

7 * 8 = 56 keys

Was unsold at 100 keys for 1 month:

http://www.tf2outpost.com/trade/25677667

http://www.tf2outpost.com/trade/25809708

Taking 100 keys as all other sales occurred before/during backpack.tf's currency conversion. This probably would sell extremely quickly at ~50 keys now.