Actually, Mikey, some of the regulars here do buy guns and not shoot them. For your first few deals, look for folks with high trader ratings and personal recommendations.
Hungry, Girls Guns & Fast Bikes, Dizzy Dan, Sandyamac, Doug, Mysticplayer, Badboybeeson, SuperCub, PerversPépère, Willwagspal, ClayBuster to mention just some of the few that I've had some experience with, will never steer you wrong. If one of these guys says it's a new gun, I'd bet it's in as good a condition as I'd find at my local shop.
The Exchange forums offer some great deals from time-to-time. I don't know what you're going to be looking for; but as an example, I got my Wather OSP for $350+ 1/2 the shipping, there was a FAS 602 for $375 that took weeks to sell (fair value would have been closer to 500, I would have snapped it up if I could have found the money).
Right now Hitzy has a really nice Mossberg 340KA for 190+shipping, Huntinstuff's Marlin 444 is a pretty good deal for 400+10 for shipping and Majormarine has a very good deal on a Norinco NP29 for $400 +shipping, that's another I'd snap-up if I had the money (his deal on the Walther P38 is excellent too; but you'd probably want something that was more of a 'shooter' for one of your early pistols).