As accurate as the information obtained from either the Best Buy or Walmart api is probably the best answer I can give you. This is more of a hobby project for me than anything so I haven’t been keeping close enough tabs on the competition. There are a few browser based/ chrome extensions that provide similar solutions but this is purely web based.

https://www.reddit.com/r/WalmartSellers/comments/10avwct/walmart_price_tracker/