To find the cheapest soybean wholesale location, you need to consider many factors, including the quality of the soybeans, their origin, transportation costs, etc. Here are some possible avenues:

* Farmers’ Markets: At farmers’ markets, you can trade directly with farmers and get cheaper prices. Additionally, farmers markets usually have some room for bargaining, and you can try to negotiate the price with the seller.

* Wholesale market: Many cities have specialized wholesale markets, such as Xinfadi Market in Beijing, Cao'an Market in Shanghai, etc. In these markets, you can find large quantities of soybeans and other agricultural products, and the prices are usually much cheaper than in retail channels such as supermarkets.

* Online purchasing: Many e-commerce platforms now provide online purchasing services for food ingredients. Through online purchasing, you can compare the prices and quality of different suppliers to choose the most suitable source.

* Direct sales from the origin: If there are direct sales points near the origin of soybeans, you may get cheaper prices by purchasing directly from the origin. However, you need to pay attention to factors such as the quality of soybeans and transportation costs.

To sum up, the cheapest soybean wholesale location may vary depending on the situation, and you need to choose based on the actual situation.