Does anyone know where to get Herts Or Avis coupons?

I know I could go onto Hertz or Avis car rental Website for coupons, but i figured i could find more coupons through google, and I did and found some great coupons. But I was wondering if anyone could give me a direct link to a coupon site, that has really great deals for Herts or Avis? I am traveling from Columbus Ohio to Miami Florida. Also, Hotel coupons would be great as well.