do you know where I can get Leucocrinum montanum - Star Lily rhyzomes/plants please?
These are also called sand lilies.
We don't give retail recommendations, however, I think if you go online and search for retail nurseries in Arizona or other states where there are hot, dry climates you may be able to find these. Here's an article on their care:
https://www.gardeningknowhow.com/ornamental/flowers/sand-lily-plants/grow-sand-lilies-in-garden.htm