Walmart Extractor UPC and Item ID - To sell on Walmart.com you need to get the UPC information so you can list and sell the same item. You can get the same information You will begin by going to the Walmart.com product page of the item you're trying to find. Then, you will look at the the Page Source code to find the UPC. This may seem daunting, but I promise it is not. Simply, follow these steps: Use the CTRL+U (Option+Command+U on a Mac) to view the Page Source code. A new tab will open with some code. Use the CTRL+F (Command+F on a Mac) and search for "upc". The 12 digit code that follows is what you are looking for. Instead of the above process this extension will get the same information fast.