The original Red Ring 681 (null) has been discontinued since at least early 2013, perhaps longer. There are no sellers of this hp on TaoBao. I can purchase the 681f, 681b and 681 EVO, and all of the other classic Superlux cans, but the Original Red (light or dark) Ring Classic is no more.
This is direct from large volume sellers of Superlux cans:
Discontinued long gone
681 discontinued more than 2 years
If you are farther downstream in the supply chain, you should buy any pairs you see as this gem will soon go away and it's probably a good idea to get the other classic Superlux cans as well.
The 681EVO has replaced the 681 Red Ring.
Edited by marone - 1/10/14 at 4:52am