Phoenix Christown-Spectrum Mall has an in-mall promotion going.

Spend $150 in a single day, and bring your receipt to the mall office (only open M-F 8:30 AM - 5 PM), and receive a free one-day Legoland California Park Hopper ticket (good at Legoland, Sea Life Aquarium, and Legoland Water Park).

Limit one per person. However, if you go in with more than one person (children included), each person can receive a ticket.

Note that the following stores are in the mall, and purchases of Gift Cards are acceptable:
- Costco
- JCPenneys

If you really want to make this cheap, purchase a Visa gift card at walmart for $150 + 4x purchase fee.