I find my low fares usually through:
a) this forum
b) kayak fare alerts i've set up to various cities
c) theflightdeal.com newsletter
d) this page on united:
https://flights.united.com/en-us/fli...om-los-angeles
e) this page on hopper.com:
Fare Sales and Flight Deals from Los Angeles, California - Hopper
e) is where I found the LAX-FLL deal