Check with Brad at The Custom Wheel Shop. (One of the few advertisers here, see banner above.) He has pretty darned good pricing and is good to work with. (So I have heard, and many will agree.)
But, yes, those prices look pretty competitive.
Last I knew Detroit stopped building that wheel for the Tbird a few years ago now. Its not old stock either because that was depleted. If they actually have them then great but I would have to guess they dont...heh