As previously stated about Frys, if you know what you want it's fine. Open box deals are only worked on the non-slashed price models. The specials that are advertised are usually only good for 2-3 days, then the prices go back to their normal discounted price. The HK DP2005 was selling over one weekend for $499. It's gone now. I think the 7300 is pretty close to gone.
If you get a factory sealed box there isn't any worry. They sell HKs, Onkyos, Sonys and some Yamahas. The HKs and higher end Onkyos are the only ones worth looking at, IMO.