Again, not sure if you guys are under 25, if so, expect to pay a bit more. I am not sure how you're paying $400 for 2 days, I've used numerous rental places and the only one that you absolutely should avoid is Advantage rental car, they suck, every other one I've used has been fine. Payless, which is a national rental company has a 2 day rental for $70 total. To me, $330 is a lot of money. Also, that wasn't even searching with discounts or last minute deals...
Another option is to do a super shuttle especially if it's only for a day... that would be $40...