You can purchase tickets to H2O Glow Nights online through Undercover Tourist, a great website that offers Disney World tickets as well as Disney World hotel reservations, Universal Studios Orlando tickets and more (often at a big discount).  You can currently save $5 on tickets through Undercover Tourist!If you are a Disney World annual passholder, though, then you should take advantage of your passholder discount and save $6 on your ticket.