Hello,
I don't know why so many people are asking for CasperJS bots recently, but I enjoy writing them. Would you prefer this to run on your server or hosted on mine? I can do either. I believe it would be quicker to initially retrieve prices via the official API and then compare and purchase via CasperJS. How are the products stored in your MySQL db? Does it contain ASINs, UPC/EAN, or URLs?
Thank you,
Nick Schild