Amazon.com : Sigma EF-530 DG Super Electronic Flash for Nikon DSLR : On Camera Shoe Mount Flashes : Electronics
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Amazon.com : Neewer TT560 Flash Speedlite with 12 Color Filters and Hard Diffuser Kit for Canon Nikon Panasonic Olympus Pentax and Other DSLR Cameras : Electronics
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 : Polaroid PL-135 Bare Bulb Power Zoom Bounce & Swivel Flash For The Nikon D5300, D5000, D3000, D3200, D3300, D5100, D5200, D3100, D7000, D7100, D4, D4s, D750, D810, D800, D800E, D600,
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Amazon.com : Sigma EF-140 External Flash for Sigma DP1 Digital Cameras : On Camera Shoe Mount Flashes : Electronics
Amazon.com : XPIX High Power Auto-Focus Digital SLR Flash for Nikon D Series, F Series and Z Series Cameras + XPIX Rechargeable AA Batteries & Quick Travel Charger, Tripod, Universal Remote and
Amazon.com : Sigma EF-530 DG ST Electronic Flash for Nikon DSLR : On Camera Shoe Mount Flashes : Electronics
Amazon.com : Nikon SB-800 AF Speedlight for Nikon Digital SLR Cameras - Old Version : On Camera Shoe Mount Flashes : Electronics
Amazon.com : Neewer Flash Speedlite with 2.4G Wireless System and 15 Channel Transmitter Compatible with Canon Nikon Sony Panasonic Olympus Fujifilm Pentax and Other DSLR Cameras with Standard Hot Shoe (NW570) : Electronics
Amazon.com : NEEWER Flash Diffuser Light Softbox 6" x 5", Universal, Collapsible with Storage Pouch Compatible with Canon Nikon Sony Godox Yongnuo NEEWER speedlight : On Camera Shoe Mount Flashes : Electronics
Amazon.com : Nissin MF18 for Nikon Macro Ring Flash - TTL Flash with Soft Diffuse Light and Precise Control for Professional Macro Photography, 1/1 to 1/1024 Power, User Friendly Controls : Electronics
Amazon sells an AmazonBasics flash for Canon and Nikon DSLRs for just $28: Digital Photography Review
Amazon.com : Sigma EF-530 DG Super Electronic Flash for Nikon DSLR : On Camera Shoe Mount Flashes : Electronics
Amazon.com : Sigma EM-140 DG Macro Ring Flash for Canon SLR Cameras : On Camera Macro And Ringlight Flashes : Electronics
Amazon.com : Sigma EF 500 DG Super Flash for Nikon SLR Cameras : On Camera Shoe Mount Flashes : Electronics