Massdrop has the Cardas Premium Clear Light Sennheiser cables on a pretty good drop.
I've been meaning to replace the cable on my 800 since I "foot snapped" mine and I have the right connector held on with a Dremel sanding drum, epoxy and adhesive shrink wrap (hey, it's lasted 2.5 years).
Anywho, they have a limited supply so get em while you can.
https://www.massdrop.com/buy/cardas-premium-clear-light-headphone-cables?mode=guest_open&utm_campaign=Transactional%3A Joined Drop&utm_source=SparkPost&utm_medium=email&utm_term=Transactional%3A Joined Drop&utm_content=1533318863207.581789544912634407427395&referer=69JPD7&utm_content=1533318863207.581789544912634407427395