mousy is right - the number of people is not usually a problem.
I always travel with 6 and we have never flown to Flordida and back for more than $100 US a seat.
Keep checking the website and when you see a deal you like book it and if you get a Ding that is even better - rebook and you will get a credit for future travel or call them and they will credit you the money back to your CC.
We love flying SWA.