How I saved about $50 a day on my rental car in Las Vegas

So, while in Las Vegas I wanted to try out the Toyota Prius (Hybrid). The only catch was that it cost about $89 a day, while the economy cars (same size, but gas powered) costs $39 a day. I understand that a Prius is fuel efficient, however I'd have to do an awful lot of driving to compensate for the extra costs, and seeing as how I didn't plan on leaving a 10 mile radius, this was awfully hard to justify. Fortunately I found this website called RetailMeNot which contains user-submitted coupon codes for various websites. Because I won't always remember to check first before making a purchase I installed a firefox plug-in that will glow green whenever I'm on a website that has a coupon code available. The code that was available at the time was for a Hertz employee friends & family rate which shaved about 50% off the cost of the car. When I traveled to Europe this fall, I also saved about 35% using the same code, and rented a Mercedes Benz CLK, convertible, navigation, running across several countries and there were no questions asked about the discount :)

If you use Hertz, I do recommend the online check-in, print your receipt and scan it at the Kiosk when you get there, the less human interaction the better :)