One more thought (or two). I have found seiju and jacqueline hillier elms at Glover Nursery for reasonable prices. They weren't grown for bonsai, but there were a couple that were usable. I've found japanese black pine at Cactus and Tropicals in the past, and once there was even a kotobuki. But they aren't plants that are normally stocked. I'm going to crawl through Millcreek Gardens this afternoon to see what they have. But unfortunately, nothing bonsai specific. There isn't a large enough community here to support it. But there are some really great trees in private collections. One of our club members had two trees in the Artisans Cup over the weekend.