Sure it is much cheaper if you order at PRC mainland.
But the problem is:
1. Do you know where you can make it?
2. How you can control quality if you're not often there?
3. Traffic cost between mainland/ HK and time
4. Delivery Cost and Procedure
5. How can you comminicate between local contractor, mainland supplier in order to archive what you really want?
It is finally save around HKD 2 to 3000 if u can settle entire problem, so i truly suggest that..... Forget it la.