You can go to 信和二樓M25號鋪, I just brought 3 from them cost HK$1418 each in colour Black / Blue / Pink / Light Blue / White including : R4 lan card / protection sticker / transformer / 2 pencil / plastic box case全套. Also I have check the price in 黃金, they offer around $1500 up. 信和 are the cheapest one I've found.