Searching for product information is disclosed, including: receiving a search request that includes at least a desired purchase quantity and a desired unit price; determining a preset purchase quantity that corresponds to the desired purchase quantity, wherein the determined preset purchase quantity is selected from a set of preset purchase quantities and each of the set of preset purchase quantities is associated with a different predetermined number of units; generating a search query that includes at least the determined preset purchase quantity and the desired unit price; and using the search query to search for matching products, wherein a matching product is associated with a unit price corresponding to the determined preset purchase quantity that corresponds to the desired unit price.