Right now you should be able to lock in at around $235 mid or $265 full max per week, not including taxes and fees. Rates change all the time so predicting future prices can be difficult. During summer peak periods rates traditionally go up, but sometimes you can still find good deals.
Check http://www.carrentalsavers.com and http://www.mousesavers.com and book the cheapest non prepaid rate you can find today. Anything you can find under the rates mentioned is good. Keep checking your rates and the discount sites for new deals.