With shoppingmalljapan.com a ¥111,000 item did cost me pretty much exactly HK$10,000 upon arrival. Shipping was roughly US$ 90 - so their handling and fees was about HK$800 . That cost includes also shipping from the seller to their JP warehouse.
There is some IMHO unnecessary cost. They convert the ¥ to US$ to a poor rate, rather then bill me directly in ¥.
Ok, buyee.jp has an online calculator: ¥111,000 > ¥129,550 inc. shipping = HK$ 9,881
Not a HUGE difference, Need consider that this includes not shipping from seller top them. In the end it's about the same.