There are a couple of ways to save:
1) Attend November 12 and get the Opening Night discount. Tickets are $14 on opening night plus a service fee of $9.20 per ticket for $23.20 (versus $17 + fee = $27.34). No promo code needed. Go online to Ticketmaster here to get Opening Night discount.
2) Save $5 per ticket with promo code SAVE5. Enter the code on the first page (after you select your date) in the box labeled Offer Code near the top. It does not get used at the end during check out. Offer ends November 11. Buy tickets online here.
Disney On Ice: Princesses & Heroes will be at NRG Stadium. November 12-16. Parking is $10.