Many people consider buying products from Chinese shops. Some because they want to save a few euros on their purchases and others because they intend to resell them in their ecommerce at more expensive prices, thus making a profit.
While it is more attractive to buy from Chinese stores with free shipping, it is worth noting that not all of them are as economical as they seem at first glance. In some of them the shipping cost is already adjusted to the total price, I only recommend you to check very well each Chinese store and the prices they offer there. Anyway their prices compared to other stores are still much lower. In relation to free shipping, I can tell you that if you use this method, then you will have to give yourself the idea that your product will not arrive as fast as you expect, because normally these products take at least 30 days to arrive.