I have a pair of HD800 I haven't listened to in months. I'll be honest they were my go to headphones and have chips, the stock cable has exposed wire at on end and needs repair or replacement. However I have a pair of working cable I got from eBay that are decent, however they're only 5' long and require a 1/8 - 1/4 adapter. Asking price is $700 OBO. Price includes shipping via UPS Ground and Pay Pal fees. Complete with box, manual, both sets of cables, a seen headphone holder.
Hit me up if you're interest or have questions. With apologies for the crappy pics.