where to buy the Chocolates in bulk

Hiii,
Any idea where can I buy a bulk of chocolates at reasonable rates in Tokyo Area ?

I want to buy around at least 5-6 Kg of chocolates as I will be visiting my home country.

Thanks in advance,
VJ

Hello!

I think maybe there are at some candy stores in Ameyoko between Ueno and Okachimachi, such as Niki?
And Don Quixote sell 1kg size packs of chocolate.

COTSCO is the best
They have tons of choclates nicely packed, also lot of snacks, cookies and dry fruits

Thank you all !!!
Yes, I am thinking of visiting both Donki hote in kamata and Costco in Kawasaki this weekend.

Thank you again,
VJ

You can get varieties of chocolates cheap whatever or how many the guy throws in a bag for a set price. It is called "tataki uri"
http://www.youtube.com/watch?v=OQcMc551WRk

many confectionery stores have chocolates in bulk variety and also you should try in malls.