I always use SouthWest Air lines car rental page. We have a Premium car for 8 dayes for $163 base rate, but with all of the Las Vegas crazy taxes and add ons the total is $308.98. The rates change all the time and a few times I have even got a lower rate buy checking back from time to time. We make our rental several mounths in advance and always seem to get a good base price, it is the add ons that kill you.

This site lists most major car rentals and is the most user friendly for me. You can resereve the car with no cost until the pick up.

Link to SouthWest car rental page

http://www.southwest.com/cgi-bin/carTab?ss=0

Good luck. Having fun Steve