I recently traded one of these, may as well take the time to seek an update.

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http://www.tf2outpost.com/trade/13899751 (owner had a 1 bud + 1 key buyout. I'm pretty sure it sold in less than a day)

http://www.tf2outpost.com/trade/13921734 (Derpeh looks to have sold it for at least 27 keys, he's a top contributor here so I'll take his word for it.

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Proof I paid $51.66 USD on the steam market on the 8th of July.

http://i.imgur.com/7YR3YKE.png

http://i.imgur.com/7gBkMXr.png

http://www.tf2outpost.com/trade/13548747 (received notable offers of stormy storm trilby and circling peace crown)

http://backpack.tf/stats/324/5/29 (trilby updated in the last month, 1.4-1.5)

http://backpack.tf/stats/342/5/18 (crown updated in the last month, 1.1 - 1.6)

I ended up trading it for an unusual stormy storm whoopee + 2 keys 2.88 refined + at least 9 refined in item (fast learner, baggies and clean kringle)

http://backpack.tf/stats/174/5/29 (stormy whoopee updated in the last month, 1.2 - 1.6)

So taking the whoopee as 1.2 buds it would mean I traded it for somewhere between 1.2 - 1.5 earbuds.

Trade history:

http://i.imgur.com/2Z3Ja2I.png

http://i.imgur.com/J7YEUqd.png

http://i.imgur.com/ew27hQU.png

Funnily enough both the whoopees were level 95.