Focus on analyzing the functional requirements and design requirements of e-commerce platform.
Different requirements, different prices, because the development cycle is different.
According to the simplest b2c, design+foreground+background, estimated to be 2w, which is a normal industry standard, excluding cabbage price. After all, it's worth it.
Then maybe you heard that you can make one for a few thousand yuan or five thousand yuan. I don't deny that it exists, but it makes sense. A common template can be easily used with a few modifications. But if it is the result you want, it is unrealistic to do it completely according to your idea.
Finally, the same sentence: different needs, different costs. There is no fixed standard.