Travel Tips?

As I will be flying from Columbus to Kona in May, (and tickets jumped up $100 last night!! Yikes!) I thought I would ask my super-smart LJ friends for travel-bargain tips. I, myself, am a big fan of Travelocity and Priceline. I use Travelocity to figure out the cheapest days to travel, and then use Priceline to name my own price and get an even cheaper price on those days. Does anyone else have any other suggestions? Secret websites that not a lot of people know about? Secret passwords and codes that get you huge discounts? Is your dad a pilot with a plane who will take me to Kona for free? :D