What is the way to get the cheapest rental car?

Go to Enterprise Rent-A-Car or Priceline...(they'll give you the online quote real fast...)

as mentioned before google car rent Denver and expedia or travelocity , sometimes going to the website directly gives a better deal. I would recommend NOT to take car insurance, it is usually covered by credit card and your regular car insurance should cover rentals, so all you get hit with is a deductible (in case of an accident). It saves some cash. I did check Denver this winter and for some classes of cars it was considerably cheaper to rent in downtown Denver as oppose to the airport. It will take you longer to get to the terminal but it is something to consider.

Use Priceline or Travelocity to price the different car rental places for what you're needing. There is a place in some areas that will rent you older cars for $10 a day (like 1990's cars). Google "car rental Denver" and you'll probably find some better ideas as well. Last time I rented a car, I had a coupon with Hertz and got a great deal. I ended up renting a car for 7 weeks and it only cost me $700 (after a car accident).

Among others consumers Reports Rates Rental cars, ,, their qualities and, their prices. Have a great trip This information can be obtained on the internet at www.cu.org/reports/rentalcars

Research on the net, statt with hot wire, but some times there are ridiculously high rates at certain places.

Try the major rental car companies in Denver and see what rates they have and if they have any special rates going on. The person that recommended not taking insurance. First make sure your insurance does cover a car rental.