After the buyer receives the quotation, the price judgment is a good screening criteria. As mentioned above, when the model, manufacturer, package lot number is different, the price will be different, and after the change of time, the market price is also fluctuating; In addition, another type of supplier will misquote or deliberately low prices to get the buyer to negotiate with the supplier. In the case of the above problems, buyers should make accurate judgments. If they do not want to negotiate with low prices, they can directly ignore some suppliers of low prices. In addition, there are great differences in the prices of original authentic products, domestic original products, loose new materials, machine materials and so on. From these prices, we can also know what kind of material is corresponding to the price offered by the supplier.