Monoprice Blackbird 4K 4x4 HDMI Matrix, 18G, 4K@60, YCbCr 4:4:4, EDID, 4K to 1080p Downscaler, IR - Monoprice.com
Amazon.com: HDMI Splitter 1 in 2 Out 4K 60Hz 4:4:4, AVIDGRAM HDMI 2 Port Splitter with Downscaler for Dual Identical Display Support 1080p 120Hz HDMI2.0 HDCP 2.2 HDR10 Dolby Vision 18Gbps 3D
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4-Port HDMI 2.0 HDR Splitter with EDID & Downscaler
BLUSTREAM HDMI 4K to 1080p Downscaler from Alltrade
4k Hdmi Converter Up/down Scaler 720p 1080p For Video Wall Combine With 1 Splitter And 4 Converters Support Five Splicing Modes - Audio & Video Cables - AliExpress
Amazon.com: XOLORspace 36R2 HDMI 1080P to 4K up Scaler and 4k to 1080p downscaler : Industrial & Scientific