I recommend a booking site for a car rental. The prices range vastly and booking a car will reduce the cost by a LOT!The airport has dozens of car rental places and the booking site should have a list.
Ikea, Costco and Craigslist will be your best bets. I would recommend renting a Subaru Outback or Toyota Rav 4. They will have the most room for that size of an SUV.