missy missy - SWA alway credits you back your $$ and you have 1 year to use the funds. So if you book a flight and have to cancel you just go on line and cancel and then you have the funds available to rebook later.
Same goes for when the price drops on your flight - you can go in cancel your original flight, book the new lower fare and have a credit available to you.
I think SWA wants to fly with full planes and that is why the do business in the manner in which they do. They do not cancel flights or have big delays.
Congrats on the good fares you booked! Now if you keep watching they still might go down! The lowest fare I booked from BUF - MCO was $29 and my family of 6 flew return for only $481 - it was great. But it sure does spoil you.