Amazon.com: eSynic 4K HDMI Audio Extractor HDMI to HDMI + Optical TOSLINK SPDIF + Analog RCA L/R +3.5mm Jack Stereo Audio Video Splitter Converter with Power ON/Off Switch Support 4K Full HD1080p
Amazon.com: HDMI Audio Extractor Converter, 4K HDMI to HDMI + Audio (SPDIF/ Optical +3.5mm AUX RCA L/R Stereo), Audio Adapter Splitter for Blu-ray Player, PC, Laptop : Electronics
Sonos Optical Audio Adapter Optical digital audio to HDMI adapter cable at Crutchfield
HDMI Single-Mode Converters
HDMI to HDMI+Audio Converter, Output Audio Connectors (SPDIF, Coaxial, 3.5mm Jack), Input Resolution up to 1080p, Black Color - Walmart.com
Amazon.com: Tensun 4K HDMI to HDMI Optical SPDIF TOSLINK Converter Adapter with 3.5mm RCA R/L Stereo HDMI Audio Extractor Splitter for Blue-ray PC Laptop Xbox One HDTV : Electronics
Hdmi Rca Converter Audio | Analog Digital Converter | Hdmi Hdmi Rca Splitter - 1080p - Aliexpress
Amazon.com: Tendak 4K x 2K HDMI to HDMI and Optical TOSLINK SPDIF + 3.5mm Stereo Audio Extractor Converter HDMI Audio Splitter Adapter(HDMI Input, HDMI + Digital/Analog Audio Output),AV-096-BK : Electronics
Amazon.com: Mini 4K HDMI Fiber Extender - HDMI to Fiber Converter, 4K HDMI Video Optical Transceiver Up to 20km Over Single-Mode Fiber with External Stereo Audio and RS232 : Electronics