How weaned is weaned, or a better question is what size? I agree with Bama in that I don't see the point of starter if you are talking 400-500 pound calves.. For those we have been known to feed a 13% or even just a creep mix and grass/hay depending on the time of year... If they are smaller I might pull them aside and give them a higher quality ration but otherwise I would go with more a grower ration than a starter... This year we got them started about 1-2 weeks before weaning by putting out creep feeders that we have for them right than... That way they learned about them before they wre bellering for mom.
I would stay away from TSC for the most part... They have some feed there, at least our local one, that is the same as one of the local elevators sells, Kent, but it will be 10-15% more expensive at TSC.. Have been known to use them if I got stupid and forgot to get feed and run out on a weekend... Generally happens with bum calves or lambs.