Skype, and Duh...
Assuming you're in the US, and not Moscow... or Gitmo, get them direct from AKG/Harman.
Specify part # 2458M12020
Customer Service Administrator
I paid $14.74 per pad + $7 FedEx Ground.
You could always try the K702 Anniversary/K712 pads, which are memory foam and far more comfortable. When I tried those on my Q701s they completely muddied the sound, plus they're more expensive. I'm not advising it, just giving another option. I sold mine on, so I can't compare them to the Q701 pads.
Edited by ThurstonX - 1/5/14 at 9:56am