Shopee is an e-commerce platform in Southeast Asia and currently has no official business in mainland China. If you want to buy products on Shopee in mainland China, you can try the following methods:

1. Use cross-border e-commerce platforms: Some cross-border e-commerce platforms (such as overseas shopping websites) may provide purchasing services on Shopee, and you can buy products on Shopee through these platforms. Please note that purchasing services may charge a certain service fee and require certain risks.

2. Find domestic agents: Some domestic agents may purchase products from Shopee and sell them in China. You can find these agents through search engines or social media and contact them to buy products.

3. Contact the seller directly: If you find a product you like on Shopee, you can try to contact the seller directly and ask if you can ship it directly to mainland China. If the seller agrees, you can pay through Alipay, WeChat, etc. and provide your delivery address.

Please note that when shopping across borders, you need to pay attention to issues such as customs duties, shipping costs, and return and exchange policies of the products. It is recommended that you read the relevant terms carefully before shopping and choose reputable sellers and platforms.