NJRC holds meetings monthly (as does PARC in the Philadelphia area). At the NJRC meetings we frequently have members selling frags, but at our March meeting we're planning an all out frag swap. I'm planning on fragging some of the more rare corals I've acquired for this one.
PARC also does a lot of trading at their meetings. They have some great reefers participating in the club, some of which run online stores as well.
Definitely check with your local reef clubs for area swaps.