I reserved my August 2017 rental last November. I haven't seen it cheaper since, and I check a lot. I have 2 weeks for $424, last August I paid $405 for the same 2 weeks. I'm thinking mine isn't going to budge. I'm still checking and hoping, though..
Ouch. Last August and the year before I paid in the $200's for 2 weeks. I got the rate about a week before my trip in 2016 and on July 3rd in 2015 so keep checking often. It was the last week of August/first week of September though which is usually not peak season there.
When posting rates please post vehicle type. Minivan vs compact is night and day rates.