Kneel down and beg the great gods, is there any way to bring an iMac from Hong Kong or Macao back to the mainland without paying taxes?

This may not work. Actually, Macao is very simple to take. Fly from Macau Airport to China instead of Gongbei Port. Domestic Shanghai airport does not check. Hongqiao doesn't even check. I always bring a few bottles of Louis XIII xo back to China. Macau Airport doesn't care what you bring out of Macau. As long as it can be checked. The Imac27 bought in Macau can also differ by the exchange rate difference of 0.003 between Hong Kong dollars and Macao dollars. I brought some back to China. Pack and check at the airport. There was a delivery box when I bought it in the store, and my shell was very strong. Remember to register fragile labels at the airport.