Looking for tool for find ad examples on Facebook

Maybe someone can suggest any tools to find ad examples on Facebook?

For example, I found a product to sell and I want to find maybe someone selling this product on Facebook and have a good promoting video of this product.

That's a good question I'll be interested to hear if anyone else has any thoughts on it. Anyway...

Facebook Ads Library, an official Facebook feature. A quick Google search should bring it up. It allows you to search/view all Facebook, Instagram and Messenger ads. Limitations? It's not intended to answer the question "What're the ads related to this specific product?" Instead, it's intended to answer "What're the ads ran by this advertiser/Facebook page/brand?" But thankfully, you can use it in both ways -- so it may just fulfill your needs.

Want even better results? Try Googling your competitors first and make a list of them (e.g., if you're selling watches, Google "site:myshopify.com watches"). Then use this list to search through Facebook Ads Library.