Amazon.com : YONGNUO YN568EX III Wireless Master & Slave TTL Flash Speedlite with High Speed Sync for Canon DSLR Cameras : Electronics
Amazon.com : Yongnuo YN320EX S 2.4G Wireless Flash Speedlite, HSS 1/8000s TTL M Multi Master Flash Unit, for Sony Cameras for Sony a7 a7ii a6000 A7R-II A7R a6300 a6500 : Electronics
Amazon.com : Yongnuo YN560 IV Speedlite Flash Supports Wireless Master Function : Electronics