This is what I will be doing this spring, too (raising day-olds and then selling them as started pullets) - have an order in with McMurray which is supposed to ship 1/28/13, I've had good luck with the birds they sell in the past, and hatcheries are really the only sellers of day-olds where you can order just pullets, unless someone is breeding a sex-linked breed, like Wendell should be able to pick out pullets day one.
There's a possibility there will be an additional order from Urch, BTW, not sure yet whether it would be earlier or later than the one we already sent in, and if my first group of started pullets sell well and quickly enough I will order anther group to raise. I'll start taking reservations next month, and if anyone wants something specific I'm sure it isn't too late to add to the order. Right now I've ordered 25 each Barred Rock, Buff Orpington, White Leghorn, and Ameraucana/Araucana.