LAX has a new multi-level economy parking garage, with bus service to the terminals in a special lane around the route (which is reserved for buses only). Check out rates here:

https://parking.flylax.com/

If you give them your email address, they'll send notices of occasional sales, which the lower the rate even a bit further.

I find that it generally has rates much lower than, for example, the Parking Spot, which is what I used to use after Lot C closed before the LAX economy parking opened.