That's crazy expensive. I rent for around $30-$40 (Canadian dollars). Booking several weeks in advance, mind you. I often rent over Saturday night to Sunday morning. The near by place doesn't open until 9:00 on Sunday for returns, so I rent at 9:00 on Saturday even though they are open at 8:00 already, so I can return it within the 24 hours. During certain peak season times, they about double the rate. At those times, I favor the co-op in which I have a membership.
Depends. I did take one from Avis roughly $70 for a whole day with some fee. But not all the time and again depends. I have AAA though. Just to be clear, for zipcar, one full day can be super expensive. Deals like $85 a day is seasonal (like Labor Day).