Another type of C2B employs the "group buying" approach, drawing together members of an online community who share a desire to purchase a particular product. Using their collective buying power, such groups are able to negotiate deep discounts and guarantees of quality and service. An example of a site employing this model in Taiwan is the Green Principle website part-operated by the Homemakers 'Union.
另一種是參照「共同購買」原則，由一個網路「社群」收集眾人的消費需求後，用集體群購的力量和廠商議價，以取得優惠折扣及品質、服務等各項保證，譬如和國際宅配公司合作的主婦聯盟「綠主張」共同購買機制等。