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Amazon.com : MEKE MK-14EXT-N I-TTL Macro Ring Flash Compatible with Nikon D7100 D7000 D5200 D5100 D5000 D3500 D3200 D3100 D90 D300S D600 with LED AF Assist Lamp : Electronics
Amazon.com : Bower SFD728N Automatic TTL Flash for Nikon D90, D300s : On Camera Shoe Mount Flashes : Electronics
Amazon.com : NEEWER NW600 Flash Speedlite Compatible with Canon Nikon Panasonic Olympus Pentax Fujifilm Sony DSLR and Mirrorless Cameras with Standard Hot Shoe, GN40 On Camera Flash with Manual, S1/S2 Slave Mode :
YONGNUO RF-603N II Wireless Remote Flash Trigger N3 for Nikon D90 D600 D5000 D7000 - Walmart.com
CY 20 mini Hot Shoe universal Flash Speedlite PC Sync Port For Nikon D90 D3100 D3200 D3300 D5200 D5300 D810 D800 D610|Flashes| - AliExpress