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.