Do you need to obtain one, or need to have yours fixed?
Replacements are very scarce. One source previously known has sold their stock. Vendors may have them, at mucho $$$. I regularly search eBay for a 'just-in-case' backup and have yet to find one at a good price.
To fix one, email Bill at SOBill (at) aol.com. He has fixed many of these switches, cost is very reasonable, and he is a great guy.
Larry