Joe,
There is a parts for sale section on the necchisewingmachineclub yahoo group under the Database tab and you could watch for one there. Sometimes, people will get a machine for parts and have some leftover. Occasionally, you'll find them on ebay...the addiction is all about the search.
Or you could wait and see if a complete Mira shows up on GW or CL. Once I started looking, I started seeing them pop up routinely. I wasn't after the Wonder Wheel, though. I got a Supernova for designs.
