Parser 3 sites by quantity of goods

Write a script parser (graber) to analyze the daily amount of goods sold on sites
What you need to get:
Output: Daily report (Exel format)
By e-mail in the format: Category Products - Subcategory - Article Products - Name of Products - Number of Remaining - Quantity of Sold - Price_from_site (pc)
Considering possible discounts, the amount (number * price).