I bought my 5D from Wolf Camera online 3/24/06 for $699. They are at $649 now. Who knows if prices will go lower or the supply will dry up.
As of yesterday, the Ritz/Wolf camera web sites now show sold out (stock information changed to "Ships when received from manufacturer"). I don't know if they are *really* getting anymore or not.
I think the supplies dried up (although some local stores may still have stock).