http://www.dj-dao.com/ for djDAO IIDX controllers. The US sales page is still in development, when that's done, pricing for shipping and whatnot will be definite, as will be a PayPal account and a potential US-based warehouse. The base pricing on their Platinum edition (basically an ASC with all the original IIDX components) is around $250+ship. Supports USB and PS2 port.

Also I'm not sure how much you'll save by using a depot service, but anything you want to import can also be gotten on Yahoo Auctions Japan for good prices.