Great news for US otaku fans! Otaku Mode has recently opened up a new warehouse in the US. This means that for US customers, it would be faster (and cheaper) if you buy products that are already in their US warehouse. I believe this would be mainly for products of popular series such as Dragon Ball, One Piece, Naruto, and Gundam.
On the other hand, that also means that if you purchase products from both US and Japan in one order, the packages would have to be shipped separately (I imagine shipping costs would also cost more).
Again, if you register with my link, you could get $5 off your order :).