Not sure when you are leaving, but if you have enough time to get them from Undercover Tourist (via mail) then I would go that route. It won't save you a ton, but every little bit helps.
The resorts can sell any ticket except for annual passes. I do agree with mdsd8700, purchase tickets through an authorized ticket seller like UT or Maple Leaf Tickets. Even if you plan on getting annual passes, purchase discounted Magic Your Way tickets, use them once, then upgrade them to APs.