Mod please move this to an appropriate thread if this is not correct

I am looking for a 3-day car rental in NYC or more specifically LGA. The dates are from 24th to 27th of May
I searched on Hotwire, Orbitz, Expedia, basically everywhere and the cheapest I can find is $230 for a mini van and $250 for an economy car.

I have 500 Hertz point (Gold member) and Executive level at Emerald Club

I wonder if anyone knows of a way to use Amex points or Ultimate points or Southwest points or any other ways to save money on car rental

Thanks a lot