If you do a Google search for AVALON, CA, you should get some info. I was just there in June and I believe it was $30 for 2 hours plus a $20 deposit but you get it back when you return. You must have a valid drivers license to rent one and the ONLY take cash.
Teresa and Larry
#36-Carnival Splendor 9/16/12
7 night Mexican Riviera
#37-Allure of the Seas 11/11/12
7 night Eastern Caribbean