I need a flight to Miami ASAP

[coast2coast21]

I need a flight from SFO to MIA ASAP.

I've been told that it's cheaper to go to FLL and take a shuttle.

I'm okay with both, but I've never used my own price with Priceline.

What's the process? Always use a different "takeoff city" ? I remember reading that in the past.

Biggest question: Can I get a same day flight? I need to be in downtown Miami by 5:00 tomorrow.