Blackmagic UltraStudio HD Mini
UltraStudio HD Mini UltraStudio HD Mini features professional broadcast quality connections that include 3G-SDI, analog YUV and composite NTSC/PAL video inputs, along with a reference input. UltraStudio HD Mini even supports ProPresenter's Alpha Keyer Module for key/fill outputs or downstream keying. Only $495 (NOTE: requires a Thunderbolt 3 cable, which is not included)
** This Blackmagic product is specifically made for Thunderbolt 3 (USB-C) equipped Macs.