Ted
This is a link to an ebay seller offering the item - $17 which seems pricey. Searching the web you will find other stores that sell them for a lower price but are out of stock. You may wish to try the 'basic 57' switch. very cheap without LEDs direction to test your application and then you can be ready when the upgraded deluxe comes available.
Atlas Illuminated Deluxe Switch Control Box #57
The Zstuff uses momentary switches. IMHO, any momentary device - that works and doesn't stick - will do it for you. I do not use the Atlas momentary. I purchased some pushbutton momentary from electronics stores - some are bussman, MJA and Allelectronic. They are tiny and do not have the LED feature the Atlas has but they do work with either z1000 or z2500. I added small lites on the panel - not LEDs - to show direction of the turnout on the control panel. The overall result is less footprint used on the panel which was my goal. I do very much like the look of the Atlas 57. You can gang them together which is another nice feature, but that may cause some of the momentary's to stick.
Ralph