Shoppingagent

I'd second what Cohen said about e-baying it or perhaps on Yahoo.jp? If nothing works, maybe consider giving it to a friend for his/her birthday present XD?

Thanks sooo much for your advice,people.
The items are a bit abnormal. maybe not so many people consume that.That is the problem.
I decided to expand the market of it after all.

It's kind of harsh but as the agent offering the service you were kind responsible for getting the bonus present. If the shop didn't send it to you, the buyer has a right to want to cancel.

Why don't you add an extra link in your website to sell some of the cancel items? Maybe sell them out as a cheaper price to attract people, rather than total lost. (as long as the items are still in good condition, not mean to sell out some damage product) Since you have more customers checking out your website daily than the past, you might be able to sell those items out on your own without paying the service charge from ebay or yahoo auction. You should give it a try, neverknow it will work or not, at least on your own website, you can post them as long as you want. Hope you will find a buyer to buy those items from you ^^