B Stock : M Audio M-track Eight 8 Channel Interface - Andertons Music Co.
Focusrite Scarlett 18i8 (2nd Gen) 18 In/8 Out Usb Audio Interface Four Focusrite Mic Preamps Professional Recording Sound Card - Headphone Amplifier - AliExpress
Best 8 Channel Audio Interfaces
USB 6Channel 5.1 Optical SPDIF External Sound Card Audio Adapter for PC Win Mac | eBay