By now, you all know I am pretty good at finding deals, especially when I can sit from one place and search. Aside from using Costco.com to check for travel bargains, I also use this application from Southwest called Ding! If you have Southwest in your area, it really is the best application ever to finding travel bargains!
Upon downloading it, you can specify which cities you're interested in, including your origination airport(s) or even your destination airport(s), and the program automatically alerts you with a ding on my computer when flights become available. It's completely unobtrusive (pictured above, only an icon representing the Southwest Airlines plane tail will display in your system tray) and is not bundled with adware, spyware, or any other software.
Through it, I've been able to book a couple of trips to Los Angeles for $29 each way and $59 to Las Vegas each way. Incredible, right?! Give it a try because with these prices, it's practically free to move about the country.