I bought this switch from Smallbear about ten years ago, probably around 2000. It cost $13! Before that time this was a high tech item that was only available in Fulltone products from what I understand. Legend has it that he had them designed and specially manufactured for his boxes. I guess wiring a true bypass box with an LED easily was worth it to him to invest the time and money to get these things made. Not sure how they ended up at Smallbear. Steve probably figured he could sell a few, I bought 1, and Mike Fuller had enough stock on hand to pass some on to Steve.
Now days you can get these everywhere and the prices seem to get as low as $3.50 each, though the price seems to have settled around $5 on average.