Here's the accessories shown available online:Wow. This thread didn't go anywhere, although most folks here likely know the answer: Check the website.
The punchline however, is that no accessories are separately available in the U.S.
If it's not with your factory-delivered car, you cannot get it.
Here's the accessories shown available online:
Do they show as not available if you try to order?
I got one - pulled it out of the other showroom model on day of purchase (actually swapped out the entire mat set (4 mats + cargo area) for the a rubber set). Highly recommended.. had carpet in my former SUV rear section and much prefer the 'grip' of rubber flooring (in addition to protection) so things don't slide around so easily back there.