Official Hong Kong Official Apple Store sells unlocked iPhone 5. However, you cannot walk in to purchase one. Instead you have to enter a lottery each morning in order to secure an appointment at the Apple Store to potentially purchase an iPhone 5.
Try your luck, go Reserve and Pick Up iPhone 5 to get one.
Apple iPhone 5 Price : 16GB HK$ 5,588, 32GB HK$ 6,388 , 64GB HK$ $7,188.