If you live in Texas, your local HEB has a sale on giftcards. They are all 20% off (with coupon), and at this point, it seems as if there is no limit. There's a thread on SD about it, if you need more firsthand experiences. The majority of people on SD have had luck finding the yellow 20% off coupons. I'm going to head over there after work and grab $200 worth of GC. It's not only Southwest though, it works for Amazon, Borders, Home Depot, and more. If you live near an HEB, check it out!