Thanks for reaching out!
At this time, it does not look like we have plans to receive more stock of the Arc'Teryx Zeta AR jacket. Sometimes, we are able to order items for customers that we do not currently carry in our stores or online. That process is called a 'special order' and we do have the ability to place such an order with Arc'Teryx. A special order can only be placed in your local REI store and is dependent on vendor processing and availability. You'll want to connect with the customer service team at your local REI store to discuss placing that order.
Hopefully this helps, thanks!