I just bought a tan pair today, size 6 1/2 at Madison in Malibu. They had one other pair left, size 7, in black. There are two styles of these boots: one with buttons down the sides, and one without; both styles have zippers down the back. The ones that Nicole Richie and Lindsay Lohan have been photographed wearing DO NOT have buttons, and they are the ones that Madison carries, and I believe Barneys in Beverly Hills (and online) has the other style with the buttons. I am usually a size 6, and the 6 1/2 fit perfectly, so I would say they run a bit small. The price on these was $725. Good luck!!!
I called Madison a week ago and they said the smallest size they had left was 10, so somebody else must have claimed the size 7. It's okay though, maybe I can justify buying another pair of ballet flats instead.
Barney's in Seattle had a few pairs left also. Be warned though: the shaft of the boots is extremely small. The SA who showed them to me was tiny and about a size 5 and she said they barely fit her calves.