Black Magic Design ATEM Production Studio 4k w/ box $600
Excellent condition, with original box. $600
ATEM Production Studio 4K lets you connect up to 8 SD, HD or Ultra HD 4K video cameras, disk recorders and computers to do true broadcast quality work. You get all the features you expect from a professional switcher including chroma key, transitions, media pool, downstream keyers, audio mixer, multi view and the world's first 6G-SDI and HDMI 4K video connections.
As long as you understand the Black Magic framerate preferences, this unit will work well.