1. online purchase: search for Cai Boli tongsheng or tongsheng almanac keywords on e-commerce platforms such as Taobao and JD.COM, and then select merchants with high credibility to purchase.
2. Offline purchase: If you buy in a physical store, you can go to a reputable local calendar and Feng Shui store for consultation. These stores will sell Cai Boli Tongsheng.