for those who are looking to get new stuff you can check out the prices here first for comparison for different electronics, home & computer stuff, though in Chinese it's easy to navigate or you can use:
Google Translate
add more links if you know any
Jumbo Computer Supplies
Computer Stuff
http://www.price.com.hk/group.php?g=5
http://www.price.com.hk/group.php?g=8
Computer Accessories
http://www.price.com.hk/group.php?g=6
http://www.price.com.hk/group.php?g=7
House Hold Appliance
http://www.price.com.hk/group.php?g=9
http://www.price.com.hk/group.php?g=4
Cameras
http://www.price.com.hk/group.php?g=3
Mobile Phones
http://www.price.com.hk/group.php?g=1
Game Consoles
http://www.price.com.hk/group.php?g=2