If you want a basic GI style pistol there are a few options, some being harder to find than others.
Obviously Colt, although it sounds like most people around here usually have to wait a while or have one brought in (which also involves waiting).
I like plugging Springfield, my GI model was my first pistol ever and its a great gun that closely resembles a WW2 era M1911A1. Thumb safety and grips were the only changes I made to complete the vintage look.
Another I like is Rock Island Armory, mine has been a solid reliable pistol without a single issue. They also make a version that resembles the pre A1 pistol, with a half moon front sight.
No personal experience myself, but Auto Ordnance also makes a decent looking repro of the GI pistol. Looks like they made an honest effort, down to details like a wide spur hammer and short shelf thumb safety. Price seems to vary, I've seen them anywhere from 6-900 bucks.