Check out mousesavers.com under rental cars. In the past there was a small description of this company. I have not used them personally but everything I have read about them as not been favorable. I understand that their rates are low but at what cost. I have read about filthy, run-down cars and less than helpful customer service.
You can probably do just as well by using some of the codes on Mousesavers. I have a full size car with Thrifty for 17 days in August for $386 with all taxes. It is off-site but it is a short shuttle ride away.