Accessories4less has this refurbed for $320. Woot has this unit new for only a little more, not a bad deal.
The deal breaker for me is it not rated for 4 ohm speakers. Of you're running all 6 or 8 ohm speakers, this isnt a bad deal for a nice Onkyo reciever.
Accessories4less sells the upgrade to this model, the RZ620 for $350, which is 4 ohm stable, however it is a factory refurb.