Here's an article on buying US GI 1911's -

http://www.coolgunsite.com/buying/buying.htm

They're around, some are relatively inexpensive while others are very expensive.

It depends on which company made it, the number produced, and the condition. Refinished guns will generally command a lower price.

Check out GunList for some leads.

Bring a big check book Their going higher and high each day.
I have a shipped from Colt Aug, 1941 Colt USGI and its better than stock market of course I 'm not selling . I had mine about 15 years back then wasn't worth much. Today .

We had one in our evidence/gun room in Petrolium County Sheriff's Office. It was clearly marked "United States Property" on the right side of the slide, and parkerized. I had looked at it for possibly a duty weapon, but then I would of had to change out my duty holster and mag holders for the 1911 from the Glock 22 that had been carrying.

This was a free one given to us by Fergus County Sheriff's Office prior to me arriving there. I could have purchased this from our department at the time for a song of a deal.

Of course hind sight.....