UPDATE:
I'm getting a limited number of these from Korea as a test run.  If you want to pre-order them, the price is $3.55 per button.  This includes the button, the lamp assembly, the microswitch, and the nut.  Available colors are yellow, green, red, and blue.
Like I said, I will have a very limited number of these, so first come first serve.  I expect to receive the shipment in 10 to 15 days.  PM me or post here.