Question / Advice needed

Hey everyone,

I have an idea for a new database I want to work on. I need datafeeds though.

I''m ok paying for a feed as long as it has high quality data. The two merchants I'm mostly interested in right now is Target.com and Walmart. Possibly Costco data.

I'm curious if anyone knows how these sites populate their data?
https://www.shape.com/shop/
https://www.parenting.com

I also came across this site. No clue what their trying to accomplish but they appear to be pulling data from somewhere. Although, not well organize. It's what I'm looking for. https://dealsform.com/

Any help would be greatly appreciated.

Comic