The only "Orthodox" community I have found in 13 years of doing this is the Orthodox classical yahoo group mentioned above. Its not strictly classical format nowadays, seems we have people doing a bit of everything.
Orthodoxy does not seem to have caught on to the homeschooling issue the way protestant Christianity has, and some folks have been bold enough to tell me its a cultural issue. I have had to find homeschool groups online or locally-but I am careful to find ones that are located out of non mainstream churches (the one I have now is based out of an ''evangelical-free'' church, whatever that is) or even secular groups. I live in the Bible belt in a famously protestant area, so its probably a bit more hostile to Orthodoxy than it should be. Look for local groups and see their statement of faith, if they have one. Or start one with a playgroup at a local park, lots of folks just do that. An impromptu picnic or soccer game is a good way to meet others that are hs'ing.