In a repeat of a past promotion, you can save up to $50 on any Spirit Airlines fare for travel June 16 to Nov 17. This promo ends tonight at midnight. The promo code is SAVE50.
You'll always save $10 on any Spirit fare if you book on their site vs. on a third party site like Kayak.com. So you're really only saving an additional $40, but still.
However, with this promo, if you're a $9 Fare Club member, you can combine the discount with their current sale fares, some of which are so low that you'll end up paying nothing for your flight, even with taxes figured in. See a sample booking we were able to make, below.