Pricing information and price comparison
I got started in this area many years ago when I used the Amazon Product Advertising API to automate the look up DVD pricing for a client. He got lists of DVDs for sale from wholesalers and used my program to compare the wholesalers price with the Amazon price so he could determine which DVDs were worth buying. What would take him a month to do manually, was done in an hour with the program. Since then, many changes have occurred. Amazon has limited the Product Advertising API and moved sellers to the MWS API. I took my original program and modified it for generic use for the general public and called it PriceCheck. I have many versions of it, but the concept is the same. Automate the process of looking up pricing information and comparing prices.
PriceCheck looks up Amazon pricing information such as Sales Rank, Buy Box price, Buy Box owner, FBA fees, profit and ROI calculations, lowest new price, lowest used price, total number of new and used items for sale, etc. so you can determine which products to buy and competitively price them for sale. I use PHP and Python to access the Amazon API calls to retreive the pricing information. The Python version runs on a standalone computer and has no limitation to the number of items it will look up. It can look up by ISBN, ASIN, EAN, or UPC. See more information about PriceCheck
I have customized the basic PriceCheck for many users over the years. I can simplify the output and remove whatever columns you don't need. I can also add additional information from the Amazon API if what you are looking for is not listed.
Some clients only sell on ebay. Research your competitors on ebay. Find out what they are selling and what prices they are getting for their items. Get detailed information about their listings including the Item Specifics section and the Watching count.
Need something else? Please contact me and I would be happy discuss developing a solution for you.