Isn't Kakaku just a price comparison search? I used it for S680 and the cheapest one shipped is Amazon.jp.
Have you guys used Tenso? Although buying from small companies would be difficult, Amazon.jp doesn't seem so bad since they have a guide specifically for that site.
How much cheaper is Tenso vs. Whiterabbitexpress to the U.S.? I'm wondering if it's worth the extra hassle of ordering yourself.
Kakaku has it's own forwarding service BuySmartJapan. Just click on the banner at the bottom of the page:
Usually it will be as cheap or cheaper as other forwarding services.