Deals and Promotions

Where people get them?

[Nova]

Hi, Could please someone tell me where websites with coupons, specials, and promotions get this information from? I understand where this information is coming from when it comes to Amazon, but what about small websites and local stores? How do their promotions appear on the websites with deals?

Thanks,
Nova

[Nova]

I see that part of it comes from CJ. What about local coupons, like grossaries? Thanks for your help!