@AZPhil Thanks for reaching out!
Because the model you are asking about is not a model that REI normally carries, the process by which you would order it is called a 'special order'. A special order can only be placed in your local store. The store will confirm that the models you want are available and order them for you. It is important to bear in mind that when you do a special order, processing, shipping, and fulfillment are the responsibility of the vendor, so timelines can be highly variable.
Hopefully this helps, thanks!