Wen Jing Clothing Market in Beijing, or at the entrance of Beijing Institute of Fashion, all these places sell watches. You can go and have a look.

As for what you said, it should be cheap, either second-hand, or online shopping will be cheaper and physical stores will be more expensive. Of course, just be careful not to buy fakes.

We are professionals, and from a professional point of view, people are not suitable for being greedy for cheap. The value of mannequin lies in typesetting technology, accuracy of size control, accuracy of parting line and durability of materials. Does it help you? Cheap won't solve the problem.