PAX Prime 2013 badges are on sale now. Just expect the website to be hammered to all fuck right now from everybody jumping on at the same time.
Apparently people who got through the queue say 4-day badges sold out within the first 5 minutes of the site going live which is really fucking retarded.
EDIT: Whelp. Five minutes. Record time. https://twitter.com/Official_PAX/status/324583487359303681