FromJapan and Buyee spring to mind.

3rd party sites like these do charge commission, and shipping costs are an unknown until the item arrives at their warehouse for an accurate shipping quote. Their sites are completely up to date and translated into English quite well to bid on Yahoo Auction listings.

I frequently use Buyee when getting something off Yahoo Auctions. I'll always do my best factor in the extra costs when I'm bidding though, sometimes you've just got to find something going cheaper, if money is a problem.