axGear HDMI Over Coaxial BNC RG6 Converter 3G HDMI to SDI Box Adapter - Walmart.com
HDMI to 3G Dual SDI Adapter Converter - Video Converters | StarTech.com
Amazon.com: HDMI to SDI Converter, Micro Converter One HDMI in Two SDI Output (with Power Supply Adapter, Audio Embedder Support HDMI 1.3, 3G/HD- SDI Auto Format Detection Extender for Camera CCTV : Electronics
Blackmagic DesignCONVMBSH6G Price: $185.00 Mini Converter HDMI to SDI 6G with LUT Support
Blackmagic Micro Converter HDMI to SDI 3G w/PSU
Mini SC1221 - HDMI to SDI Mini Converter - AVMATRIX