Walmart organizes products listed on their marketplace by UPC. You can find what UPC a specific product is using by inspecting the product page's source code. This is an advanced technique that allows you to find the most popular UPCs for your products.
- Go to the product page of your choice on www.walmart.com.
- Right click anywhere on the page and you will see 'View page source'
3. On the source page press CTRL-F if you are on Windows or CMD-F if you are on Mac and search for 'upc'
4. Look for "upc": followed by a 12 digit number
Walmart does not UPCs visible for ALL listings. This method provided by Listing Mirror is a tool to be used when made available by Walmart.com
If the UPC cannot be found with the above method, you will find to source another method to find UPCs.