I've had good luck with quite a few, price point, Nashbar, Jenson to name a few. If you are ordering a lot of Japanese parts try Chain Reaction out of the UK, I've always had good luck with them, although there are horror stories about their returns program.
A few good resources are Qbike and Spadout which will give you the price for a lot of on line retailers so you don't have to search each one individually. Amazon will sometimes have really good deals and free shipping. Don't overlook google either.