Generally speaking, if our vacation is 1 week or less, I'll park at Economy Lot C at LAX. When we go on our international vacations though (1-3 weeks), I'll just use Uber/Lyft.
try CheapAirportParking.org... seems like it ends up being a little cheaper. It also works well for SNA where you can park at the Hilton? across the street for about $6-8 per day.