There are only 3 of these in the whole world, and 2 of them haven't left the unboxer's backpacks.

There are two valid sales that give this hat both it's low end price, and it's high end price.

For the low end of 4.8 the JuJu was sold for a Cauldron Bubbles Surgeon Stahlhelm.

Proof of the trade: http://i.imgur.com/DhbZTTj.png

Trade History of the Surgeons: http://i.imgur.com/y9w0toW.png

Trade History of the JuJu: http://i.imgur.com/exXzJ0w.png

Now, for the high end of 6 buds:

53 keys for the Pot + 35 keys for the for the Noble = 88 Keys/14.5 keys per bud = 6~ buds.

The JuJu was sold for a P.Fetti Noble Amassment of Hats + Flaming Lantern Stainless Pot.

Proof of the trade: http://i.imgur.com/M7yfMKJ.png

Trade History of the Noble: http://i.imgur.com/uDIdUvS.png

Trade History of the Pot: http://i.imgur.com/xXqykYy.png

Trade History of the JuJu: http://i.imgur.com/9yBpDjH.png