The cheapest flash for Nikon DSLR cameras is sold by Amazon under their brand AmazonBasics and it costs only $28. Here are the details: External flash for taking professional-looking photos in low-light conditions; compatible with Canon and Nikon DSLR cameras 3 flash modes for versatility: M, S1, S2 (Manual mode, Slave mode 1, and Slave … Continue reading The cheapest flash for Nikon DSLR cameras costs only $28