Strange decision by Jeep with such a popular colour …Billet was discontinued in late April. Agree that is very odd, but it really happened! One would assume some silver will return someday, but for now it cannot be ordered. Only hope would be to find one in existing dealer stock.
That might be why its still on the site. The build and price is meant as an inventory search tool. So maybe there are still some out there? Then again the site is always way off from the current state of things. Your best bet is checking the latest order guide which can be be found here:
Although even that had billet listed for a month or 2 after it was done.