I have from uniquecoral.com and have had a great experience (Zoa, and Xenia with a few others). Have also got some from Saltwaterfish.com (frag packs) which ended up a 50/50.
Question I'm wondering is if anyone has any idea about limits on how much coral you should or could put in a tank. Fish you have the inch/gal limits but I have never found anything about coral limits.