Seeking Summer Car Rental- negotiable price

I’m a visiting assistant prof looking for a car rental from late May (or early June, if you want) through to late August (or part of that period). I have a perfect driving record (no tickets, no accidents), will keep your car spotless, non-smoker, Cali licence. Open to flat rate or mile-based rental. Price depends on the car, but I am definitely willing to drive an old one— I grew up driving a rusty old Accord and loves it. If it runs, that works for me. Car must be properly insured and registered.