Nikon D3200 or Canon 550D

Has anyone tried - AZON DEAL DIGGER (just google it) There is a little gold box on the site that gives discount promo codes for any product on Amazon. Got my Nikon d3200 for cheaper than the listed rates. Don't know how I found ZON CRAZY DEALS, was just googling. Now, I use this tool before I buy anything on Amazon.