Shenzhen shares a border with Hong Kong and is known for its bargain shopping. (Be prepared to negotiate!)
If you have a little time and are traveling between China and Hong Kong, making a stop in Shenzhen could save you money. Fly into Shenzhen and then cross the border either via ferry or walk across the border at one of the two metro stations. Typically domestic flights in China are significantly cheaper than an international flight to Hong Kong…not to mention, a nights’ lodging is also significantly less. Within a couple of hours you can easily cross the border and arrive safely into the heart of Hong Kong.