Oriental Garden Supply has a good reputation in the area (Rochester NY region). I've been there once, LOTS of plants of all kinds, some very interesting stuff. They supply Japanese maples to other local nurseries. Overall, prices seem consistent with other decent nurseries in the area. Since they are so close, I've never had anything shipped.
Mulberry Creek was a vendor at the most recent National Exhibition. Really interesting collection of unusual plants, mostly small and cheap. I hope they are planning to come back next year. Maybe they vend at some of the other bonsai shows in the midwestern region? Give them a call and ask.