seems on sale across different websites. never saw them on sale officially before:
https://www.bhphotovideo.com/c/product/1224739-REG/sennheiser_506911_hd_800_s_open_back.html?
https://www.amazon.com/Sennheiser-HD-800-Reference-Headphone/dp/B00PXLX2TC?
https://en-us.sennheiser.c
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