According to the information I have learned, Mr Yvonne Shang's perfume belongs to the brand of Guangzhou Enron Import and Export Trading Co., Ltd., and can be bought in official website or specialty stores.
If Mr. Yvonne's perfume is not available in the market, it may be because the sales channels are limited or the products have been discontinued. It is recommended to inquire or consult the staff at the brand official website or the exclusive store.