I was able to find these:
Sesame Place:
Sesame Place: 15% off single day E-Tickets with promotion code: ACCESS (may end any time before 10/31/08)
Sesame Place: 20% off Single-Day Admission with promotion code: lowes (may end any time before 10/31/08)
If you are a AAA member, call your local office to find out about their discount. Your AAA / CAA membership may also get you discounts inside the park - make sure you bring your card!
Hope they help!