Amazon.com: Headset Extension Lead/Extension Cable with Break-Proof Metal Plug – 20ft (Ideal for Connecting a Gaming Headset or Headphones with Microphone, TRRS, 4-Pole, 3.5mm Male to Female) by CableDirect : Everything Else
Hi-Res Headphone Extension Cable – 64 Audio
Grado 15 Foot 6.3mm Headphone Extension Cable - Audio Advisor Inc.