How do retailers and CPG companies track competitors' pricing?

• Wal-Mart uses computer programs to scan prices on competitors’ websites. These competitors prices are then used to adjust Wal-Mart's listings.
• The company uses a variety of tools to track competitors' prices. 
•  WalmartLabs, Wal-Mart's technology unit, is the structure in charge of gathering these prices from competitors.
• Amazon has reacted by blocking the programs used by Wal-Mart for a few weeks, resulting in Wal-Mart obtaining the data from secondary sources during that period.

Cost of Price Monitoring Software

• The cost of price monitoring packages varies depending on the product and the plan:
• Prisync's professional plan costs $59/month for 4 price updates/day, and includes the tracking of 100 products.
• Price2Spy offers a variety of premium plans from $39.95/month for 100 product URLs to $999.95/month for 50,000 product URLs.
• Repricer's ultimate plan allows to track an unlimited number of product prices for $379/month. 

Which companies offer service(s) that provide retailers or CPGs with competitive pricing info?

•  Netrivals is a company that can provide competitors’ price monitoring as a service to retailers.
•  PriceManager is another company that provides a price monitoring solution to be used by retailers, manufacturers and partners.
•  Competera also provides price tracking and monitoring services.