You would need to discuss that with the website concerned. Explain how your proposal benefits them and they then have the choice to accept or reject your proposal.
Scraping HTML is easy in theory but can get very complex depending on how much variety goes into it. Each site will vary the output from time to time and you could have a full time job decoding the HTML each time it changes, and you'd have a LOT of downtime for your own users while the changes were incorporated into your own website.
So I suggest you start negotiating with the sites concerned to get access to their data feeds. If after your proposal they still say no then I suggest you look someplace else. Or you could learn to program, then you can find out first hand the difficulties involved in screen scraping.