There are only 2 of these around.

1st:

Owned by Goblord, never traded http://www.tf2outpost.com/trade/5732487

Also had this up with an offer for it http://www.tf2outpost.com/trade/6689397

2nd:

Currently owned by bogleg |DoW™ and has a B/O of 15 http://www.tf2outpost.com/trade/7011196 and says he won't take less than 13. It has been up for offers for a very short time.

Previously owned by _Hans:

http://www.tf2outpost.com/trade/6049764 http://bazaar.tf/trade/36044 These were his trades. He sold it through Hexide though, for cash: http://puu.sh/1yWdj . The buyer paid 380 dollars which is ~11 Earbuds going by backpack.tf price. Since this was the only succesful trade that went through and offers haven't been so high, I'll set that as the high range. The money _Hans actually got (Hexide takes a cut) was 342 dollars, ~10 Earbuds going by backpack.tf price. I'll set that as the average then, and give it a lower range of 9.