To find competitive products in competitor stores on Amazon, you can follow these steps:

1. **Determine keywords**: First, determine the keywords related to your product. These keywords should be the ones that potential customers may use when searching for products.

2. **Use Amazon search**: Enter these keywords in the Amazon search bar and view the search results. Pay attention to information such as the title, product image, price, and number of reviews.

3. **Analyze reviews**: Check customer reviews on the product page. Products with a high number of reviews usually mean higher sales and better customer satisfaction. At the same time, read the reviews to understand customer feedback and suggestions.

4. **Check sales ranking**: Check the sales ranking of the product. Amazon's Best Sellers page shows the best-selling products in each category. This can help you find hot-selling products on the market.

5. **Analyze prices**: Compare the prices of the same product sold by different sellers. Price competitiveness is one of the important factors that influence purchasing decisions.

6. **Observe product lists**: Observe your competitors’ product lists carefully. See if they offer bundles, discounts, promotions, etc., which are all strategies to increase sales.

7. **Use third-party tools**: Use third-party tools such as Helium 10, Jungle Scout, SEMrush, etc. These tools can help you analyze your competitors’ product performance, keyword strategies, etc. in more depth.

8. **Monitor ads**: Pay attention to ads on the Amazon platform. Competitors may promote their products through ads. Observe their ad copy and images to understand their marketing strategies.

9. **Social media analysis**: Check your competitors’ activities on social media to understand how they promote their products and how customers react to them.

10. **Update information regularly**: The Amazon market changes frequently, so it is necessary to update your competitor information regularly. This can help you adjust your strategy in a timely manner.

Through the above steps, you can find competitive products in your competitors’ stores and adjust your product strategy accordingly to improve your market competitiveness. Remember, continuous monitoring and adjustment of your strategy is key to staying competitive.