Best "All Inclusive" deal I found last year for car rental at LAX was pre-booking through Budget Car Rental in the UK.
Got a Mid-sized car (bigger than a Mondeo) for £500 for three weeks (approx £167 a week!). Also, when we got there we were offered an upgrade to a Mustang Convertible (and very nice it was too) for only an additional $150 for the entire three weeks!!
They also chucked in a free cellphone (for emergency use only) which would have been very useful if we'd broken down in the middle of Nevada.
Hope this helps.
[This message has been edited by Professor TailSpin (edited 25 June 2001).]