I don't shill for ebay (not here anyway), but I see an ongoing auction that may be of interest. Factory EV switch, at least $24 w/ship to beat the current bid. Ends 30 April. I am not vouching for the seller, but note 100% positive feedback. Not sure it has been confirmed functional in 2007 Prius.
I stayed in San Jose a couple of weekends ago at a Fairfield Inn near the San Jose airport, not more than a block away was E-Bay headquarters. In fact i was so close and i have used them so much, i wandered over and asked the kind man behind the security desk if i could just look into the room where they keep all that stuff
lol. They dont keep all that stuff. Ebay is just a middle man operation to connect people to people. They might keep some things there and sell them privatly, but 99% of items on ebay are just people selling crap at their house.