Do you have any friends that are cops?
One of my dad's good buddies is a county cop and when they get new issue firearms the department allows them to purchase their old issue firearm back at the same price that they are going to get from the supplier on the trade in.
His friend isn't really into guns other than his personal duty carry so every time he gets something new he buys his old back and sells to my dad at his price. In the last 10-15 years he has gotten a Sig p226, P229, P232, Colt Detective Special in .38 special, and a Ithaca 37 D.S. Police riot shotgun. He has gotten some pretty smoking deals on them too.
If you can find someone willing to do that, that would be your best bet. The best thing is you know who owned it, how much it was shot, and if they took care of it well. I know in most cases they are carried a lot and shot a little, which makes them excellent buys.
As for dealers, yeah your going to get an inflated price however they are usually still pretty good deals. I see them at Bud's and JG like others have said but I would also check locally, I seem them at a local shop quite a bit and that's probably the ones I would go for since you can actually check the one your going to buy out yourself instead of say a vague grading system like JG uses.