PowerColor's Thunderbolt 3 Devil Box is the easiest way to get an external GPU on the MacBook Pro | AppleInsider
Razer Core X External Graphics Thunderbolt 3 eGPU Enclosure LN90878 - RC21-01310100-R3W1 | SCAN UK
Razer Core X Chroma: Thunderbolt 3 External Graphics Enclosure (eGPU) for Windows 10 and Mac with RGB Chroma Lighting : Amazon.co.uk: Computers & Accessories
Razer Core X External Graphics Card Enclosure with Thunderbolt 3 Connection - Black : Amazon.co.uk: Computers & Accessories