Yiwu International Trade City is probably the largest wholesale market in China. It covers almost all kinds of small commodities. The prices are cheap in general, but you need to be resourceful in order to find the best deal.
Product quality is comparatively less than that in Guangzhou and Shenzhen, especially for clothing, electronics, leather products etc.
The market is huge and it’s recommended to have a general idea about where your products are located before you go there and start exploring, as it’s going to take you a few days and even weeks to check out everything in this area.