I like to buy different cute things online, such as phone cases, makeup, decorations for my house. And I think that you can find a lot of stuff cheaper than in some irl shops. For example, I bought an iPhone case on the internet for 1$ when the same case in a shop is 5$.
But when it comes to clothes, I prefer to go to the shop, because I need to measure my clothes and see how they look on me. Sometimes I don't like how they fit me, even tho it looks beautiful on the model.
Also, the best way to find good deals on the internet is to check the online shopping news. They can help a lot.