Amazon.com : GODOX TT685II-C Flash for Canon Speedlight Camera Flash E-TTL Speedlite High-Speed Sync, 2.4G Wireless X System Compatible for Canon Flash 5D Mark IV 6D Mark II 7D 90D 250D R5
Canon Speedlite EL-1 4571C002 B&H Photo Video
Digital Speedlite Flash For Canon EOS Rebel T8i 90D T7i T7 T8 77D SL2 | eBay
Canon EL-1 Flash Review by Ken Rockwell
Amazon.com : Camera Flash Speedlite Altura Photo AP-305C for Canon EOS R RP 90D 80D 70D SL3 SL2 Rebel T7 T7I T6 T6I 5D 6D 7D M5 M6 M50 M100 M200-2.4GHz E-TTL