If you happen to be looking for half dome permits on craigslist be sure to be very careful.
There is an individual by the name of "David Tran" who also uses the alias "David Tanner" who is scamming people.
Not only is he selling permits for $50-$60, he is selling the same permits to many individuals.
So, if you purchase a said permit and get checked by the ranger and another individual who purchased from David Tran gets checked first, you will be FINED.