If you’re paying for it yourself, go to Travelocity and plug in a two-week car rental period at the San Diego airport (SAN) – Advantage is $198 for 24 June through 8 July including taxes. Fox is about $225.
So more like $15/day 🙂
As far as insurance, yours may pay for it if you have collision/comp. Otherwise, you can try going after their insurance directly. I did that when some dumb bint hit my car in NJ — they paid book value + 10 days car rental after coming out and appraising my car less than 24 hrs after the crash.