Just want to say that pirated DVDs are usually not good deals. If you're buying movies that are already out on DVDs/VCDs, then the pirated copies are usually just the VCD version cramped onto a DVD. Despite what it says on the box or even on the disc's own menu, you don't get 5.1 surround sound, multi-language, subtitles on/off. In fact, some discs just put either just the English or Cantonese soundtrack on the DVD, making them even worse than the VCD (which usually put one language on L, another on R). AND the video quality is basically the VCD version, which is actually slightly worse than VHS.
And then, you don't really know if the disc is in PAL or NTSC. If you have a multi-region multi-system DVD player at home, fine. If not, you take a chance.
For about the same price, you can just buy the official VCDs at a real store. That's the reason why Hong Kong people don't even care about these pirated DVDs anymore.
But if you're looking for discs from brand new theatrical releases, then that's a different matter.