Is it this one? If it is, then it's a Coach Leather Gigi in Whiskey, I think she also carrys a Coach Patent Leather Gigi in Putty. It's no longer available in boutiques, but you *may* still be able to find one in a Coach Outlet (you could call them and if they have it, they will reserve it for you for two weeks) you could also probably find it on *bay if you keep looking. The price could range from $300-500. Good luck!
I actually got this bag while on vacation in Florida. I went to the coach outlet in Florida 2 weeks ago (Sawgrass Mall). Final price was $230. I picked it up in in camel and my mother-in-law swiped the last one almost simultaneously. (Maybe there's more in the back?) When I saw the movie on Friday I freaked out - looks nice on the big screen. The price on the tag was nearly $700.