I knew I had seen this somewhere. User name crystal on the auschristmaslighting forum posted this below so it looks to me like this person IS the vendor.
http://auschristmaslighting.com/forums/index.php/topic,8975.msg80262.html#msg80262
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Hello everyone,
Now i introduce a new ws2813 led to you,ws2813 led is ws2812 updated version,dual-signal wires and signal break-point continuous transmission,so never worried the led broke.
Thanks
Daisy