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Amazon sells an AmazonBasics flash for Canon and Nikon DSLRs for just $28: Digital Photography Review
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Amazon.com : Sigma 55mm Macro Flash Adapter : On Camera Macro And Ringlight Flashes : Electronics
Neewer Universal Soft Mini Flash Bounce Diffuser Cap for Canon Nikon Flashes - Walmart.com
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Sigma DP1 available for pre-order at Amazon | Engadget
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