br-e-fashion mh755
Confirmed genuine Sony MH755 eBay sellers:

Ships from Japan:
- kanoya https://www.ebay.com/itm/333337657196

Ships from China:
- electronhero https://www.ebay.com/itm/283640313921
- bestneed_3c https://www.ebay.com/itm/173801920628
- macpart168 https://www.ebay.com/itm/163061670685
- xirui_01 https://www.ebay.com/itm/401711764387
- rwtf3024 https://www.ebay.com/itm/303156834713
br-e-fashion mh755 How to get it? br-e-fashion mh755

Ships from USA:
- br-e-fashion https://www.ebay.com/itm/202700671783
- mini-coin28 https://www.ebay.com/itm/202796790931
- spassear https://www.ebay.com/itm/361884429431

Ships from UK:
- mini-coin28 https://www.ebay.com/itm/202218346275

Ships from Australia:
br-e-fashion mh755 How to get it? br-e-fashion mh755
- simplecom https://www.ebay.com/itm/173494292544

List is non-exhaustive and there is probably other legit sellers on eBay and AliExpress. White version is very likely to be genuine, black version is very likely to be fake.

Don't forget the cable is very short, you need a 3.5mm extension cable that is at least 50cm long to make them usable, can get those cheapest on AliExpress for $1-3.
br-e-fashion mh755