Wordpress duplicate alert - open to bidding

Hi What I wanted was a piece of code I can insert (you'll have to tell me where) into my Wordpress Amazon Affiliate site [login to view URL] to tell me if I've entered a duplicate product. This could be either a pop-up warning naming the product/s in question in a list or an email with a list of duplicates to be taken down. Its up to you which is the easiest way you want to do it as its just for me. I need this because the author of the software WZone only gave us 10 pages to use in Woozone's "Insane Mode Imput" and some of the pages in Amazon products are 400 pages in size which means I have to go fetch any other products I want in my site and add them by hand. There is a Chrome extension that you can use in conjunction with "Insane Mode Imput" but you've still got to find products yourself to put in the above software. If you can do this I'd be really grateful as there isn't a plugin to do this. Maybe some day when my site starts earning some money I'll come back and ask you to make a plugin for the above script.