Monitor the products of about 15 ecommerce sites, the total number of 1400 products

the products are live webinars, so periodically (daily, weekly or monhtly) I need to recheck them to find the new webiners/products and I need to scrape/grab/extract these data: title, description, price, hours (or the text that say at which it start and when it end), and the date of the webinars.
I found these 2 cheap techonologies for it: Diffbot.com (but maybe it is not the best because it looks to need a manual work for each website and it only export a csv or json file) and goless.com that permit to select the data and export the results into a google sheet. Other techonogies are appreciated too. If you just teach me to use goless or anotehr techonology is ok too. The important is to save money. I am not a developer just a wordpress websites builder. In the chat I can give you the link of the websites and video samples of what I need to tdo in details.