look on amazon they are from japan plus you need the pads as well also from japan.
https://www.amazon.com/gp/product/B000UPEJCU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B00RGQGR9O/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I just bought a pair of monitor headphone (Sony MDR-CD900ST) from Amazon Japan. Shipping takes 2 weeks and this will be my first proper headphone. I'll be using it on my pc, iphone & ipad.
It might sound silly but the main reason for me to get this headphone is this!
There is one on Amazon US.