Build your own 'Fusion style' drive with the d2 Thunderbolt 2 drive and SSD upgrade from LaCie
LaCie d2 Thunderbolt 2 4TB USB 3.0 / 2 x Thunderbolt 2 Professional Desktop Storage - Newegg.com
Amazon.com: LaCie d2 Professional, 10TB, External Hard Drive Desktop, Thunderbolt 3 USB-C, 7200 RPM Enterprise Class Drives, for Mac and PC Desktop, 1 Month Adobe CC, 5 Years Rescue Services (STHA10000800) : Electronics