I just ordered some from japan, a place called pop guitars/coco-sound. Try emailing them at email@example.com . I got 7 shipped for $215 from them, much better than the prices at allparts.com, and they only had bass side.
I got mine here. You need to order them straight from Japan if you want a custom configuration; they're basically made to order in this case. And yes they are amazingly light and a perfect upgrade for five strings, couldn't be happier.