I have purchased Zoas from xtreme and can vouch for his beautiful assortment Here's a pic of what I picked up off him last year. Not sure what he has available now but he had some of the nicest frags I've ever seen. (Sorry pic is blurry)
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Red Coral Online Store
www.redcoralaquarium.net
45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp