Dear,
Referred to the project description, I have parsed all data from Lowe's, including the department and sub-categories info. The columns are [cateID, depts/cates, itemID, modelID, prodID, prodName], with totally 11,000+ records.
If you are interested in these data, I am very happy to forward them to you for your reference.
To make the task done, I developed my web crawler in Python (with libraries Re/Regex, BeautifulSoup, Mechanize).
I will be very pleased to help you to generate the rest of the data from Walmart as well as HomeDepot.
Look forward to hearing from you.
Cheers.