How much shower gel and shampoo should I buy from Macau?

Whether you go to Macau or Hong Kong, buying toiletries will not be taxed. The shops over there, especially the duty-free shops, sweep the goods when you go in. SASA Zhuo Yue or something, domestic counters are 3-6 fold, so just let it go.

It will be safer if you travel by air. There is no X-ray entry inspection at domestic airports. Generally, bulk goods that need to be taxed are handled at the boarding gate. Just check the toiletries when you get on the plane, and don't carry them on the plane.

If you go by land, you will have some trouble getting out of the port. If you buy a lot of boxed toiletries, similar to wholesale, which have been X-rayed at the port, you may be fined if you are unlucky enough to be smoked. Hee hee ... if they are all single, they are generally around 20. Even if you travel to buy something for yourself as a souvenir, people at the port will not embarrass you.

As for shopping locally, I have been to Macau and Hong Kong many times, and no one dares to charge extra money ~! Hmm. How interesting