One way I know to earn Universal passes is through www.hiltonhhonors.com You can earn points for Hilton stays and by using their affinity credit cards. You can also earn points by converting airline frequent flyer miles to hilton points as well as updating your account profile four times a year.
A one day-one park adult pass is 20,000 points-kids are 15,000, 2 day adult escape pass is 27,500 points-kids passes are 22,500. While this is probably not the cost-effective use for points, free is always good!
There is one program that gives out Universal and IOA passes. It's called Trocamania. It's incredibly slow with only two points per day and one monthly point opportunity, but it only takes about 30 seconds per day.