I saw this listing for the shelby rims on e-bay. I haven't ever priced out 20" rims, but it seems like a pretty penny for them. There is minimal information on the carroll shelby wheels website, but I haven't seen the wheels listed anywhere else yet...maybe because they are pretty new to the market?
These rims look pretty good and it has that sweet looking gray 06 mustang pic in the ad.

Shelby_wheels

 

That $375 per wheel.
That is pretty much in the mix. 20's I have seen go for the $250-$550 range.

Unless you talk about forged, or 2- or 3- piece of course.

But, you are right, Shelby's people needs to get the web site up and running!

 

05StangKC can get you a better deal. Here is a link to a thread discussing these wheels: click
I love 'em too. I'm thinking the CS66 in anthracite?