EU Supermicro X10SDV-6C-TLN4F (D-1528, 2x10 GbE) - 399 €

[XeonLab]

Seems a decent deal for me in here EU. And hey, it's new, so plenty of hours left in it.

New-supermicro x10sdv-6c-tln4f motherboard mini-itx, xeon d-1528, ddr4, usb 3.0 | eBay

A couple of caveats:
- No I/O shield, so if you need one, buy one from Supermicro
- They give a 6 month warranty, don't know about the original warranty from Supermicro
- As we all know, there aren't that many quiet cooling options for Broadwell-DE so be prepared to buy a nice piece of Cooljag copper.

 

[Rand__]

They have been on offer for a while;
also regularly available as auction (currently here:NEUVE- Carte mère Supermicro X10SDV-6C-TLN4F mini-ITX,Xeon D-1528, DDR4,USB 3.0 | eBay) which tends to end around 360-370;
have not tried to lowball them but maybe even cheaper is possible