[US] eBay: HP RX 460 2GB ITX Graphics Card - $54.99
This GPU is an OEM version of the RX 460 2GB, built for HP SFF computers. You can install it inside an AKiTiO Thunder2/3 or Node Lite without any power modifications. It would also fit PowerColor/VisionTek mini eGFX. As of 10.14.2, there's native eGPU support for RX 460/560 so it's plug-and-play with Thunderbolt 3 Macs.