The best deals right now are police trade ins on S&W revolvers and auto pistols. Next come the Makarovs, the PA-63's and others. In used guns, the story is in your dealer's showcase. There are often good buys there.
If you want a gun as a gun, and not a prize to look at, there are always reblued guns or guns with bad finish, lots of holster wear, rust, etc. If you know what you are looking at, you can often get very good bargains on those guns. (I have in mind an S&W M&P revolver a friend bought last month for $65 that looks like it was left on the battlefield and then dragged through barbed wire, but which has a good bore and is perfectly functional. He has no intention of trying to fix it up, but will use it as is.)
Jim