Ok, gonna add a disclaimer here. It's REALLY worth having a check with a lawyer before doing this. Databases qualify as copyrightable intellectual property, and you're almost certainly breaching the site's T&Cs by scraping them.
If you were just using the data for your own internal use (like analytics or research), I'd say go for it with a proxy, but because you'll be displaying their data openly on your website, and directly profiting from its use, you could be asking for trouble.
For a few hundreds bucks, it's worth being sure, because both G and Shopping.com have their own in-house counsel who need to justify their payroll by finding people to sue.
I'm not saying don't do it... I'm just saying make sure you manage your risks properly.