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Frontier Airlines Cyber Monday sale is offering 20% off flights using promotion code CYBERSAVINGS. This is a one day only sale for travel between December 2, 2014 and February 12, 2015. Unfortunately though there are some restrictions as Friday and Sunday travel is excluded as well as these dates: December 20, 22-24, 26-27, 2014 and January 3, 2015.
I am personally seeing some great fares from LaGuardia to Miami! But remember, Frontier charges extra fees for carry on baggage, seat selection, etc. So take that into consideration when you are calculating cost compared to another airline.